Consider the following reaction where Kc = 1.80×10-2 at 698 K:
2HI(g) → H2(g) + I2(g)
A reaction mixture was found to contain 0.280 moles of HI (g), 2.09×10^-2 moles of H2 (g), and 4.14×10^-2 moles of I2 (g), in a 1.00 liter container.
Required:
a. Is the reaction at equilibrium?
b. What direction must it run in order to reach equilibrium?
c. The reaction
1. must run in the forward direction to reach equilibrium.
2. must run in the reverse direction to reach equilibrium.
3. is at equilibrium.
Answers
Answer:
The system is not in equilibrium and the reaction must run in the forward direction to reach equilibrium.
Explanation:
The reaction quotient Qc is a measure of the relative amount of products and reagents present in a reaction at any given time, which is calculated in a reaction that may not yet have reached equilibrium.
For the reversible reaction aA + bB⇔ cC + dD, where a, b, c and d are the stoichiometric coefficients of the balanced equation, Qc is calculated by:
\(Qc=\frac{[C]^{c}*[D]^{d} } {[A]^{a}*[B]^{b}}\)
In this case:
\(Qc=\frac{[H_{2} ]*[I_{2} ] } {[HI]^{2}}\)
Since molarity is the concentration of a solution expressed in the number of moles dissolved per liter of solution, you have:
\([H_{2} ]=\frac{2.09*10^{-2} moles}{1 Liter}\)=2.09*10⁻² \(\frac{moles}{liter}\)\([I_{2} ]=\frac{4.14*10^{-2} moles}{1 Liter}\)=4.14*10⁻² \(\frac{moles}{liter}\)\([I_{2} ]=\frac{0.280 moles}{1 Liter}\)= 0.280 \(\frac{moles}{liter}\)So,
\(Qc=\frac{2.09*10^{-2} *4.14*10^{-2} } {0.280^{2} }\)
Qc= 0.011
Comparing Qc with Kc allows to find out the status and evolution of the system:
If the reaction quotient is equal to the equilibrium constant, Qc = Kc, the system has reached chemical equilibrium.
If the reaction quotient is greater than the equilibrium constant, Qc> Kc, the system is not in equilibrium. In this case the direct reaction predominates and there will be more product present than what is obtained at equilibrium. Therefore, this product is used to promote the reverse reaction and reach equilibrium. The system will then evolve to the left to increase the reagent concentration.
If the reaction quotient is less than the equilibrium constant, Qc <Kc, the system is not in equilibrium. The concentration of the reagents is higher than it would be at equilibrium, so the direct reaction predominates. Thus, the system will evolve to the right to increase the concentration of products.
Being Qc=0.011 and Kc=1.80⁻²=0.018, then Qc<Kc. The system is not in equilibrium and the reaction must run in the forward direction to reach equilibrium.
Related Questions
Conservation of Mass
In the following reaction, H2 + F2 → 2HF, a student reacts 8g of H2 with 20g of F2. Assuming no mass is lost (due to the Law of Conservation of Mass), how many grams of HF is produced?
You can use the following Sentence Stem to formulate your answer.
Conservation of mass is mass _________ be _______ or _____________. In this reaction 8 _____ of ___________ + ____ grams of F2 produce ___ moles of ____________, the _____________. Since there is no _________ of ____________ due to the law of _________________ of ___________. There will be _____ grams of HF _______________.
Answers
The two main postulates that was given by Antoine Lavoisier are, oxygen play an important role in combustion and the other is mass of the reactant and product is conserved. Therefore the mass of HF is 28grams.
What is law of conservation of mass?According to Law of conservation of mass, mass can neither be created nor be destroyed. Mass can only be transformed from one form to another. The law of conservation of mass was given by Antoine Lavoisier. Every reaction in nature follow the law given by Antoine Lavoisier that is mass is always conserved.
H\(_2\) + F\(_2\) → 2HF
Mass of H\(_2\)=8Grams
mass of F\(_2\)= 20grams
According to law of conservation f mass
mass of H\(_2\) + mass of F\(_2\) = mass of HF
Substituting all the given values, we get
8grams + 20grams =mass of HF
mass of HF=28grams
Therefore the mass of HF is 28grams.
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The passage's author most vividly conveys the sense that Plumpp's poetry is like music when he
O uses words like "swing," "dance," and "sway" to characterize phrases in Plumpp's poems
O defines Plumpp as "the poet laureate of Chicago jazz and blues"
explains how long Plumpp has been writing about "Chicago jazz giants"
urges people to read Plumpp's poems and listen to the music Plumpp "immortalizes in print"
Answers
It is an amine, and it has less polar nitrogen-hydrogen and oxygen-hydrogen bonds.
A compound's boiling point is a physical characteristic. These intramolecular linkages between the molecules that make up a chemical affect these physical characteristics.
Alcohols and amino acids have the same kind of intermolecular linkages. The hydrogen bond is the name of this kind of bond.
The electrical attraction between a hydrogen atom from one molecule and an electronegative atom from a nearby molecule is known as a hydrogen bond.
The strength of the bond is in the following order: H.....F > H.....O > H......N
The H....N hydrogen bonds exist in amines, whereas the H....O hydrogen bonds exist in alcohols.
Consequently, the alcohol's hydrogen bonds are stronger and it will impart a higher boiling point on the compound.
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Answer:uses world like
Explanation:
Which answer shows the correct way to balance the following equation?
Fe open parentheses s close parentheses plus O subscript 2 open parentheses g close parentheses rightwards arrow Fe subscript 2 O subscript 3 open parentheses s close parentheses
Fe plus 3 O subscript 2 rightwards arrow 2 divided by 3 Fe subscript 2 O subscript 3
2 Fe plus 3 O subscript 2 rightwards arrow 2 Fe subscript 2 O subscript 3
4 Fe plus 3 O subscript 2 rightwards arrow 2 Fe subscript 2 O subscript 3
3 Fe plus 3 O subscript 2 rightwards arrow 3 Fe subscript 2 O subscript 3
Answers
The correct way to balance the equation is:
4 Fe plus 3 O₂ rightwards arrow 2 Fe₂O₃
This is because the equation must follow the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction. Therefore, the number of atoms of each element must be the same on both sides of the equation.
To balance this equation, we start by counting the number of atoms of each element on both sides. We can see that there are 4 Fe atoms and 3 O₂ molecules on the left side, but only 2 Fe₂O₃ molecules on the right side. To balance the Fe atoms, we put a coefficient of 2 in front of Fe₂O₃, giving us 4 Fe atoms on both sides. But now we have 6 O atoms on the right side and only 3 on the left, so we need to add a coefficient of 3/2 in front of O₂ to give us 6 O atoms on both sides. This gives us the balanced equation:
4 Fe + 3 O₂ rightwards arrow 2 Fe₂O₃
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One day it is clear and sunny, but you notice that the pressure is less than it was the day before. What weather might be coming? Why?
Answers
Answer:
I believe your answer is
Explanation:
when the pressure is less I believe it means rain is coming
how much 0.100 m h2so4 are needed to make 25.0 ml of 0.00500 m solution
Answers
Answer:
3) 1.25
Explanation:
I had the same question and somehow got it right :)
The new volume will be determined by molarity and which will be 1.25 ml.
What is volume?The volume of an object is just a measurement of how much space it takes up.
What is Molarity?
The molality refers to the moles of a solute in relation to the mass of the solvent, whereas the molarity refers to the moles of a solute in based on the volume of the solution. It can be denoted by M.
The formula of Molarity is
\(M_{1} V_{1} =M_{2}V_{2}\)
where, M is molarity and V is volume.
Calculation of volume.
It is given that,\(M_{1} = 0.1 M, M_{2} =0.0025 M.\)
Now, puts the value of given data in molarity equation.
\(M_{1} V_{1} = M_{2} V_{2}\)
\(V_{1} = M_{2} V_{2} /M_{1}\)
\(V_{1}\) = 0.005×25/0.1 = 1.25 ml
Therefore, the correct answer will be option 3.
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21.
THINK SMARTER Pablo had a
cup of shredded wheat cereal,
a cup of low-fat milk, and one
other item for breakfast. He had
about 21 grams of protein.
What was the third item Pablo
had for breakfast?
Answers
About 21 protein grams were in him. Pablo's third breakfast dish was a scrambled egg.
Describe protein.Protein makes up the majority of the body's organs, tissues, and body parts, include muscle, bones, skin, and hair. It contributes to the production of hemoglobin, which transports oxygen in the blood, and enzymes, which drive numerous chemical reactions.
What is the primary advantage of consuming protein?Your muscles' primary building material is protein. Therefore, consuming enough protein will help you keep your lean muscle and encourage muscular growth when you engage in strength exercise. Eating a lot of protein can help build muscle mass and strength, according to numerous studies.
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Here is a second order reaction A→ P. If the initial concentration of A 0.0818 M goes down 30.0% in 3.15 minutes, what is the rate constant for the reaction?
Answers
The rate constant of the second-order reaction is 0.111 M^-1 min^-1.
The given data represents a second-order reaction where the rate of the reaction is proportional to the square of the concentration of A.
The integrated form of the second-order reaction is:
1/[A]t = kt + 1/[A]0
where [A]t and [A]0 are the concentrations of reactant A at time t and time zero, respectively, k is the rate constant.
We can use the given information to calculate the rate constant (k) of the reaction for the given half-life (t1/2) of 3.15 minutes:
t1/2 = (1 / k[A]0)
Using the percentage decrease in concentration and the given initial concentration, we can calculate the concentration of A at time t:
[A]t = [A]0 - 0.30[A]0 = 0.57126 M
Substituting the given values, we get:
3.15 min = (1 / k)(0.0818 M) / (0.0818 M - 0.57126 M)
Simplifying the equation above, we can solve for k:
k = 0.111 M^-1 min^-1
Therefore, the rate constant of the second-order reaction is 0.111 M^-1 min^-1.
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______ + _______ --> H2O + FrF Complete and balance the equation representing neutralization reaction.
Answers
The general form of a neutralization reaction is HF + FrOH → FrF + H₂O
Which of the following is the formula for a neutralisation reaction?We refer to this as a neutralisation reaction. Only this reaction, which produces NaCl and water as products, is a neutralisation reaction since it involves HCl and NaOH. The resulting response is listed below: NaCl(aq) + H₂O = HCl(aq) + NaOH(aq) (l)
Which of these reactions neutralises an effect?The interaction of H⁺ ions and OH⁻ ions produces water in a neutralisation reaction, which occurs when an acid and a base combine to make water and a salt. The neutralisation of a strong acid and strong base yields a pH of 7.
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Give the formula of Plaster of Paris And some of its uses..
:))
Answers
The total number of atoms in 3.75 mol of ammonium nitrate, NH4NO3 , is
Answers
The total number of atoms in 3.75 mol of ammonium nitrate, NH4NO3, is equal to the Avogadro's number, which is 6.022 x 10^23, times the number of moles, which is 3.75 in this case.
Thus, the total number of atoms in 3.75 mol of ammonium nitrate is equal to 2.26 x 10^24 atoms.
This number can be further broken down into the number of atoms of each element present in the compound. Ammonium nitrate is composed of two elements, nitrogen (N) and hydrogen (H). For each mole of ammonium nitrate, there are 4 moles of hydrogen atoms and 2 moles of nitrogen atoms.
Therefore, in 3.75 moles of ammonium nitrate, there are 15 moles of hydrogen atoms and 7.5 moles of nitrogen atoms, which is equal to 9 x 10^24 hydrogen atoms and 4.05 x 10^24 nitrogen atoms.
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What is the mass of 6.02 x 1024 molecules of the compound HCl?
Answers
Answer:
First, we need to determine the molar mass of HCl.
The molar mass of HCl = the mass of hydrogen (1.008 g/mol) + the mass of chlorine (35.45 g/mol) = 36.45 g/mol.
Next, we can use Avogadro's number (6.02 x 10^23 molecules/mol) to convert the number of molecules to moles:
6.02 x 10^24 molecules / 6.02 x 10^23 molecules/mol = 10 moles
Finally, we can use the molar mass to convert moles to grams:
10 moles x 36.45 g/mol = 364.5 grams
Therefore, the mass of 6.02 x 10^24 molecules of HCl is 364.5 grams.
:. It means 1 mole of Hcl
:. To find the mass of HcL
no of moles = mass/ molar mass
To get the molar mass of HCL {H=1 CL=35.5}
:. H+CL = 1+ 35.5 =36.5
So we have our molar mass and number of moles now
Then we input it in the eqn
1=x/36.5
X= 36.5g of HCl
An early arrangement of the then known elements was proposed by a British scientist John Newlands, which he called the Law of Octaves. Like other scientists at the time, Newlands arranged the elements in order of increasing atomic mass and noted that every eighth element had similar physical/chemical properties. In the modern Periodic Table, which of the following represents the last pair of elements for which Newlands' Law of Octaves would hold true?
Answers
Assignment Your Unde a professor in a University has Sent you an touration 6 his Inaugural lectore wate a letter to him, showing appreciation for him on halind gesture and Congratulating! his achievements So far
Answers
In this letter, express gratitude to your uncle, a university professor, for his invitation and congratulate him on his achievements.
Here are the steps to be followed:
Express gratitude and appreciation: Begin the letter by expressing your gratitude for your uncle's kind gesture in inviting you to his inaugural lecture. Show genuine appreciation for his thoughtfulness in including you in such an important event.
Congratulate your uncle on his achievements: Extend your heartfelt congratulations to your uncle for his accomplishments thus far. Acknowledge his hard work, dedication, and commitment to becoming a professor at the university. Highlight specific achievements or milestones that you find particularly impressive.
Share your excitement and anticipation: Express your excitement and anticipation about attending his inaugural lecture. Let your uncle know that you are looking forward to being a part of this significant moment in his career and witnessing his expertise in action.
Offer support and encouragement: Offer words of encouragement and support for your uncle's future endeavors. Let him know that you are proud of him and believe in his continued success. Encourage him to keep pursuing his passion and making a positive impact in his field.
Close the letter with warm regards: End the letter with a closing remark and warm regards. You can use phrases such as "Best regards," "With love," or "Sincerely," followed by your name.
Proofread and revise: Before finalizing the letter, review it for any errors or areas that may need improvement. Ensure that the tone is respectful, appreciative, and heartfelt.
Send the letter: Once you are satisfied with the letter, send it to your uncle either via traditional mail or email, depending on your preferred method of communication.
By following these steps, you can write a thoughtful and appreciative letter to your uncle, expressing your gratitude for his invitation and congratulating him on his achievements.
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Metallic atoms tend to _____ valence electrons to produce a positively charged ion. Most nonmetallic atoms achieve a complete octet by gaining or _____ electrons.
Answers
In order to create a positively charged ion, metallic atoms frequently lose their valence electrons. Nonmetallic atoms acquire or share electrons to form a full octet.
Metal atoms form metallic connections. Ionic bonds link metals to non-metals, whereas metallic bonds link a large number of metal atoms. Metallic bonding can be observed in action on copper wires and sheets of aluminium foil. When the charge is dispersed over a broader area than the size of a single atom in a solid, metallic bonds are created. Most left-handed elements in the chemical elements, including zinc and copper, form metal connections. Metals have regular arrangements of closely packed atoms because they are solid materials.
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what is the PH scale of 0.02m of hydrochloric acid
Answers
Answer:
Explanation:
The pH of 0.02 M hydrochloric acid is approximately 1.7.
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To determine the pH of a hydrochloric acid solution, we need to know its concentration. You mentioned a concentration of 0.02 M (molar), which refers to 0.02 moles of hydrochloric acid dissolved in 1 liter of solution.
Hydrochloric acid (HCl) is a strong acid that dissociates completely in water, meaning all HCl molecules release their hydrogen ions (H+) into the solution. Since the concentration is given as 0.02 M, it means there are 0.02 moles of H+ ions in 1 liter of the solution.
To calculate the pH, we can use the formula:
pH = -log[H+]
In this case, [H+] represents the concentration of hydrogen ions in moles per liter. Since hydrochloric acid is a strong acid and it dissociates completely, the concentration of hydrogen ions is equal to the concentration of HCl, which is 0.02 M.
pH = -log(0.02) ≈ 1.70
Therefore, a hydrochloric acid solution with a concentration of 0.02 M would have a pH of approximately 1.70, indicating it is strongly acidic.
What volume of sodium hydroxide (0.167 M) is needed to titrate 18.53 mL of perchloric acid (HClO4 (aq)) with molarity of 0.242 M ? Answer in mL with one decimal place- you do not need to include units in your response.
Answers
The volume (in mL) of the 0.167 M sodium hydroxide, NaOH solution needed is 26.9 mL
How to determine the volume of NaOHThe balanced equation for the reaction is given below:
HClO₄ + NaOH —> NaClO₄ + H₂O
The mole of the acid, HClO₄ (nA) = 1The mole of the base, NaOH (nB) = 1The volume of NaOH can be obtained as follow:
Molarity of base, NaOH (Mb) = 0.167 MVolume of acid, HClO₄ (Va) = 18.53 mL Molarity of acid, HClO₄ (Ma) = 0.242 MVolume of base, NaOH (Vb) =?MaVa / MbVb = nA / nB
(0.242 × 18.53) / (0.167 × Vb) = 1
4.48426 / (0.167 × Vb) = 1
Cross multiply
0.167 × Vb = 4.48426
Divide both side by 0.167
Vb = 4.48426 / 0.167
Vb = 26.9 mL
Thus, the volume of the NaOH solution needed is 26.9 mL
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A solution has [H+] = 2.35 × 10-3 M. Find the [OH-] for this solution
Answers
Answer:
[OH-] for this solution is 4.255*10^-12
Explanation:
We are given
[H+] = 2.35 × 10-3 M
we need to find the concentration of [OH-]
we know from Equilibrium
[H+][OH-] = 10^-14
[OH-] = 10^14/2.35*10^10^-3
[OH-] = 0.4255*10^-11
[OH] = 4.255*10^-12
Therefore the Concentration of [OH-] for this solution is 4.255*10^-12
Recall that the value of K is small for reactions that form very little product. Reactions that form very little product are said to
Answers
Answer:
Reversible reaction
Explanation:
A chemical reaction between X and Y forms C according to the reaction below. The data for three trials to measure the
rate of this reaction are also given.
Trial
1
2
3
[X] (M)
0.01
0.01
0.02
X+Y→C
[Y] (M)
0.015
0.030
0.015
What is the rate law for this reaction?
OR=KX²M
OR=KX³M²
OR=KXM²
OR=KX²M²
Initial Rate (M/s)
7.83x10-5
BIBE
3.13x 104
1.57x10
Answers
Explanation: The rate law for a chemical reaction is an equation that relates the rate of the reaction to the concentrations of the reactants. To determine the rate law for a reaction, experiments are typically conducted with different initial concentrations of the reactants and the initial rate of the reaction is measured.
From the data provided, it appears that the reaction is of the form X + Y → C. And the concentration of X and Y are varied in three trials and the corresponding Initial rate is measured.
In the first trial, [X] = 0.01 M and [Y] = 0.015 M, and the initial rate of the reaction is 7.83x10-5 M/s.
In the second trial, [X] = 0.01 M and [Y] = 0.03 M, and the initial rate of the reaction is 3.13x104 M/s.
In the third trial, [X] = 0.02 M and [Y] = 0.015 M, and the initial rate of the reaction is 1.57x10 M/s.
Given the data, the rate law for this reaction is OR = KX²M. This is because when the concentration of X is doubled, the rate of the reaction is quadrupled, which is consistent with a rate law of the form OR = k[X]^2.
Which of the following animals are an example of coevolution? *
Answers
Acacia ant and acacias animals are an example of coevolution
Coevolution is the reciprocal evolutionary change in a set of interacting population over time resulting from the interaction between those population and an example of coevolution that is not characteristics of an arm race but one which provides a mutual benefit to both a plant species and insect is that of the acacia ant and acacia plant and many cases of coevolution can be found between plants and insects
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An aqueous magnesium chloride solution is made by dissolving 7.40 moles of MgCl2 in sufficient water so that the final volume of the solution is 4.80 L . Calculate the molarity of the MgCl2 solution.
Answers
An aqueous magnesium chloride solution is made by dissolving 7.40 moles of MgCl₂ in sufficient water so that the final volume of the solution is 4.80 L. the molarity of the MgCl₂ solution is equal to 1.54 M.
What is Molarity?Molarity is a unit of concentration, which measures the number of moles of a solute per liter of a solution. To calculate molarity, one divides the amount of solute (in moles) by the total volume of the solution (in liters). In chemistry, molarity is often used to measure concentrations of acids, bases, and other solutes in solutions. This unit of concentration is important in lab work, as it allows scientists and researchers to accurately measure and predict the behavior of solutions.
Molarity (M) = /\(\frac{moles of solute}{liters of solution }\)
Molarity (M) = \(\frac{7.4mol}{4.8L}\)
Molarity (M) = 1.54 M
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when working in a contaminated chemical enviroment,which one of the following devices provides the most protection against vapors or fumes froma chemical ga
Answers
Answer: gas mask
Explanation: A gas mask provides optimal protection from vapor and fumes.
What volume of CO2(g), measured at STP is produced if 15.2 grams of CaCO(s) is heated?
Answers
Answer:
Volume = 3.4 L
Explanation:
In order to calculate the volume of CO₂ produced when 15.2 g of CaCO₃ is heated, we need to first write out the balanced equation of the thermal decomposition of CaCO₃:
CaCO₃ (s) + [Heat] ⇒ CaO (s) + CO₂ (g)
Now, let's calculate the number of moles in 15.2 g CaCO₃:
mole no. = \(\mathrm{\frac{mass}{molar \ mass}}\)
= \(\frac{15.2}{40.1 + 12 + (16 \times 3)}\)
= 0.1518 moles
From the balanced equation above, we can see that the stoichiometric molar ratios of CaCO₃ and CO₂ are equal. Therefore, the number of moles of CO₂ produced is also 0.1518 moles.
Hence, from the formula for the number of moles of a gas, we can calculate the volume of CO₂:
mole no. = \(\mathrm{\frac{Volume \ in \ L}{22.4}}\)
⇒ \(0.1518 = \mathrm{\frac{Volume}{22.4}}\)
⇒ Volume = 0.1518 × 22.4
= 3.4 L
Therefore, if 15.2 g of CaCO₃ is heated, 3.4 L of CO₂ is produced at STP.
The alcohol product contains two different types of hydroxyl groups. Why does the polymer-supported reaction with methanol convert only one of the hydroxyl groups to an ether group but not the other
Answers
Answer:
The other may not be free.
Explanation:
In the polymer-supported reaction with methanol, the reaction will undergo at one hydroxyl group because others may not be free due to bonding with other molecules. The hydroxyl groups could be bonded with the polymer with the help of hydrogen bonding of molecules. The hydroxyl group has to be bonded to only the compatible molecules and free molecules.
We have that this is because of Chemoselective reaction where one functional group reacts before or in the presence of another.
Hydroxyl groups reactionGenerally, A hydroxy is a group with there chemical formula represented as -OH, and are made up of one oxygen atom in a covalent bond with one hydrogen atom.
In polymer supported response of an alcohol with methanol selectively bear response at one hydroxy to the fact the every other hydroxy can also now not be free due to it may additionally linked with the polymer via H-bonding.
Therefore, Chemoselective reaction where one functional group reacts before or in the presence of another.
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What is the orbital notation for Al+3?
O 1s2 2s22p6
O 182 2s2 2p6 352 3p1
O 1s2 2s2 2p6 352 3p5
O 1s2 2s22p6 352 3p6
Answers
A student has synthesized a new compound (compound A, a nonelectrolyte). She uses osmotic pressure to determine the molar mass of compound A. She dissolves 0.50 g of compound A in water and prepares 15 mL of solution. At 25 C the osmotic pressure is 7.38 atm. Calculate the molar mass (g/mole) of compound A. Do not include a unit with your answer.
Answers
Answer:
110g/mol is the molar mass of compound A
Explanation:
The osmotic pressure of a solution could be obtained using the equation:
π = i*M*R*T -Solving molarity we can find the molar mass of the solute A-
Where π is osmotic pressure (7.38atm)
i is Van't Hoff's factor (1 for nonelectrolytes)
M is molarity (Our incognite)
R is gas constant (0.082atmL/molK)
T is absolute temperature (25°C + 273.15 = 298.15K)
Computing the values:
7.378atm = 1*M*0.082atmL/molK*298.15K
0.3018 mol/L is the concentration of the solution.
The volume of the solution is 15mL = 0.015L. Moles of the solute are:
0.3018 mol/L * 0.015L = 4.527x10⁻³ moles
Molar mass is the ratio between mass of the compound (0.50g) and the moles (4.527x10⁻³ moles). That is:
0.50g / 4.527x10⁻³ moles =
110g/mol is the molar mass of compound AHELP ME PLZZZZZZZZZZZZZZZZZZZ
Air pressure decreases with increasing altitude. In other words the higher up in the atmosphere you go, the thinner the air is.
True
False
Answers
Answer:
True
hope this helps
Explanation:
b. How many kJ of heat are needed to completely vaporize 50.0g of water at 100°C? [Ans:113. kJ]
Answers
The amount, in kJ, of heat needed to completely vaporize 50.0g of water at 100°C is 118.8 kJ.
Heat of vaporization of waterThe heat needed to completely vaporize 50.0g of water at 100°C can be calculated using the following formula:
q = m x Hv
where:
q is the heat needed in joules (J)m is the mass of water in grams (g)Hv is the heat of vaporization of water which is approximately 40.65 kJ/mol at standard temperature and pressure.First, we need to convert 50.0g to moles by dividing by the molar mass of water which is approximately 18.015 g/mol3:
moles of water = 50.0 g / 18.015 g/mol moles of water = 2.776 mol
Thus:
q = (2.776 mol) x (40.65 kJ/mol) q = 112.8 kJ
In other words, 112.8 kJ of heat is needed to completely vaporize 50.0g of water at 100°C.
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The composition of a compound is 28.73% K, 1.48% H, 22.76% P, and 47.03% O. The molar mass of the
compound is 136.1 g/mol.
I
Answers
The compound has an empirical formula of \(K_2H_2P_2O_8\) and a molecular formula of \(K_2HPO_4\).
The given compound has a percent composition of K = 28.73%, H = 1.48%, P = 22.76%, and O = 47.03%. Its molar mass is 136.1 g/mol. To determine its molecular formula, we need to find its empirical formula and calculate its molecular formula from its empirical formula.The empirical formula is the smallest whole number ratio of atoms in a compound. It can be determined by converting the percent composition of the elements into their respective moles and dividing each by the smallest number of moles calculated. The moles of K, H, P, and O in 100 g of the compound are: K = 28.73 g x (1 mol/39.1 g) = 0.734 molH = 1.48 g x (1 mol/1.01 g) = 1.46 molP = 22.76 g x (1 mol/30.97 g) = 0.736 molO = 47.03 g x (1 mol/16.00 g) = 2.94 molDividing each by the smallest number of moles gives the following ratios: K = 0.734/0.734 = 1H = 1.46/0.734 = 2P = 0.736/0.734 = 1.002O = 2.94/0.734 = 4. The empirical formula of the compound is \(K_2H_2P_2O_8\). To calculate the molecular formula, we need to determine the factor by which the empirical formula should be multiplied to obtain the molecular formula. This can be done by comparing the molar mass of the empirical formula to the molar mass of the compound.The molar mass of \(K_2H_2P_2O_8\) is: \(M(K_2H_2P_2O_8)\) = (2 x 39.1 g/mol) + (2 x 1.01 g/mol) + (2 x 30.97 g/mol) + (8 x 16.00 g/mol) = 276.2 g/mol. The factor by which the empirical formula should be multiplied is: M(molecular formula)/M(empirical formula) = 136.1 g/mol/276.2 g/mol = 0.4935. The molecular formula is obtained by multiplying the empirical formula by this factor: \(K_2H_2P_2O_8 * 0.4935 = K_2HPO_4\). Therefore, the molecular formula of the compound is \(K_2HPO_4\).The molecular formula of the given compound having a composition of 28.73% K, 1.48% H, 22.76% P, and 47.03% O with a molar mass of 136.1 g/mol is \(K_2HPO_4\). The empirical formula of the compound is \(K_2H_2P_2O_8\). The compound's molecular formula is calculated by determining the factor by which the empirical formula should be multiplied to obtain the molecular formula. The factor is M(molecular formula)/M(empirical formula) = 136.1 g/mol/276.2 g/mol = 0.4935. The molecular formula of the compound is obtained by multiplying the empirical formula by this factor, resulting in the molecular formula \(K_2HPO_4\).For more questions on empirical formula
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The correct question would be as
The composition of a compound is 28.73% K. 1.48% H, 22.76% P, and 47.03% O. The molar mass of the compound is 136.1 g/mol. What is the Molecular Formula of the compound?
\(KH_2PO_4\\KH_3PO_4\\K_2H_4P_20_{12}\\K_2H_3PO_6\)
What is the mass in grams of carbon dioxide that would be required toreact with 80.5 g of LiOH in the following chemical reaction?2 LiOH(s) + CO2(g) → Li CO3(s) + H,O(1)
Answers
• Given the balanced equation :
2LiOH + CO2 → Li2CO3 + H2O
• We can see that 2 moles of LiOH reacts with 1 mole of CO2.
1. Lets calculate number of moles
n = massLiOH/Molecular massLiOH
→Where molecular mass LiOH = 23.95 g/mol, and given Mass of LiOH = 80.5g
∴ n = 80.5g/23.95g/mol
n = 3.36 mol
2. Determine moles of CO2 required from the equation ratio:
2 moles LiOH : 1 Mol CO2 → 1 mol Li2O3 + 1 mol H20
So,
• Moles of CO2 required = 3.36 mol/2 = 1.68 moles
,• Molar Mass CO2 = 44.01 g/mol
,• Mass of CO2 = 44.01 g /moles* 1.68 moles
= 73.94 g
• This means that 73.94g of CO2 would be required to react with 80.5gLiOH