An empirical formula of a compound provides the simplest whole-number ratio of atoms in a compound, and it can be used to calculate the molecular formula. A molecular formula provides the actual number of atoms of each element in a molecule of the compound. The empirical formula of a compound is ch2o and the molecular weight is 180.0 g.
To find the molecular formula, we need to calculate the compound's empirical formula mass and then divide the given molecular weight by the empirical formula mass. By doing this, we will obtain the integer multiple of the empirical formula that gives the molecular formula mass.Empirical formula mass of the compound = (12.0 g/mol × 1) + (1.0 g/mol × 2) + (16.0 g/mol × 1) = 30.0 g/molThe molecular formula mass = 180.0 g/mol Empirical formula mass = 30.0 g/molThe molecular formula mass is an integer multiple of the empirical formula mass of the compound. Therefore, the molecular formula is:2 × empirical formula = 2 × ch2o = c2h4o2Therefore, the molecular formula of the compound is c2h4o2.
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pentaborane-9, bshg; is a colorless, highly reactive liquid that will burst into flame when exposed to oxygen. the reaction is 2bshg(l) 1202(g) sbzos(s) 9hzo(l) calculate the kilojoules of heat released per gram of the compound reacted with oxygen. the standard enthalpy of formation of shg is 73.2 kj mol.
The kilojoules of heat released per gram of the compound reacted with oxygen is -72.052 kj/g
The standard enthalpy of formation is a measure of the strength launched or fed on while one mole of a substance is created under trendy situations from its natural elements. The symbol of the standard enthalpy of formation is ΔH f. = A degree means that it's a fashionable enthalpy change.
Enthalpy of a formation refers to the trade in enthalpy for the formation of one mole of a substance from the maximum solid form of its constituent factors. change in enthalpy is symbolized by means of delta H and the f stands for formation.
Given,
compound ΔH°f
B₅H₉ 73.2
B₂O₃ -1271.94
H₂O -285.83
Balanced chemical equation:-
2B₅H₉ (l) + 12O₂ +(g) => 5B₂O₃ + 9H₂O(l)
From Hess's law
ΔH°min = Σ enthalpies of products - Σ enthalpies of reactants
= 5× (-1271.94) + 9×( -285.83) - 2(73.2) kj/mol
ΔH°min = -9078.59 kj/mol
It is seen that 2 moles of B₅H₉ react with O₂ is -9078.59 kj/mol
For 1 mole = -9078.59 kj/mol/2
= 4539.295 KJ/mol
The energy released per gram = energy released per mol/molar mass of B₅H₉
= 4539.295 kj/mol/63 g/mol
energy released per gram = -72.052 kj/g
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Check all of the ones that are a Chemical Change * Precipitate Formation Gas Production Heat is Released Solids Freeze Liquids Condense Substances Dissolve Bubbling occurs Color Change
Explanation:
A chemical change in a changes that leads to formation new product or chemical substance having new qualities both physical and chemical.
Therefore, chemical changes can be
1. Gas Production
2. Substances Dissolve to form new substance or solution.
3. Heat is Released is a chemical change.
4. Bubbling occurs.
Rest all are examples of physical changes.
can you solve this for me?
Answer:
b...............................
Answer:
b
Explanation:
can you solve this for me?
A steam engine depends on what kind of energy conversation
Answer:
mechanical energy
the radioactive decay of a sample containing an unknown radioactive isotope produced 9062 disintegrations per minute. 15.06 days later, the rate of decay was found to be 2421 disintegrations per minute. calculate the half-life in days for the unknown radioactive isotope.
the radioactive decay of a sample containing an unknown radioactive isotope produced 9062 disintegrations per minute. 15.06 days later, the rate of decay was found to be 2421 disintegrations per minute. Half life is 7.91 days
The half-life of an amount is the time it requires to reduce to half of its original value. In nuclear physics, the term is frequently used to define how quickly atoms undergo radioactivity or how long stable atoms stay alive. The term is also used to describe any type of exponentially decaying in general. In radioactive material, the time needed for one-half of an irradiated sample's atomic nuclei to decompose (change instantaneously into the other nuclear species by emitting particles and energy), or, equally, the time needed for the number of deformation and fracture per second of a radioactive.
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How many moles of potassium oxide (k20) will be formed when 1.52 moles of potassium reacts with oxygen according to the following reaction: 4k + o2 yield 2 k20
According to the stoichiometry of the given chemical reaction, 1.835 moles of potassium oxide will be formed when 1.52 moles of potassium reacts with oxygen .
What is stoichiometry?Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.
In the given reaction 156 moles of potassium gives 188.4 moles of potassium oxide, thus, 1.52 moles will give 1.52×188.4/156=1.835 moles.
Thus, 1.835 moles of potassium oxide will be formed when 1.52 moles of potassium reacts with oxygen .
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A glass of fresh milk with 4% fat is an example of *
4 points
a heterogeneous mixture.
an element.
a homogeneous mixture.
a compound.
Answer:
heterogeneous
Explanation:
composition is not uniform through out
How many hours are there in a fortnight if a fortnight equals two weeks?
1 week= 7 days
1 day=24 hours
Which statement best explains how the solution should be made? Add 49. 6 mL of 0. 250 M sucrose to 400. 0 mL of water to get 400. 0 mL of 0. 0310 M sucrose. Add 49. 6 mL of 0. 0310 M sucrose to 350. 4 mL of water to get 400. 0 mL of 0. 250 M sucrose. Add 49. 6 mL of 0. 250 M sucrose to 350. 4 mL of water to get 400. 0 mL of 0. 0310 M sucrose.
Balance the following chemical equation by providing the correct coefficients.
I’ll put a pic.
Please help!!!!!!!
Answer:
[2]HBr + [ ] Ba(OH)2 ➖ [ ] BaBr2 + [2] H20
Hope it will help :)
Consider the following samples of gases: (Figure 1.) If the three samples are all at the same temperature, rank them with respect to total pressure. P(ii) > P(i) = P(iii) P(ii) < p(i) = p(iii) P(ii) = p(i) = p(iii) p(ii) = P(i) > P(iii) If the three samples are all at the same temperature, rank them with respect to partial pressure of helium. P_He(iii) < P_He(ii) < P_He(i) P_He(iii) = P_He(ii) = P_He(i) P_He(iii) < P_He(ii) = P_He(i) P_He(iii) > PHe(ii) > P|He(i) If the three samples are all at the same temperature, rank them with respect to density. d(ii) = d(i) < d(iii) d(ii) < d(i) < d(iii) d(ii) > d(i) > d(iii) d(ii) > d(i) = d(iii) If the three samples are all at the same temperature, rank them with respect to average kinetic energy of particles. E(i) > E(ii) > E(iii) E(i) = E(ii) = E(iii) E(i) > E(ii) = E(iii) E(i) < E(ii) = E(iii)
The ranking would be: E(i) > E(ii) > E(iii). This is because the average kinetic energy of particles is directly proportional to the temperature, and sample (i) has the highest temperature, resulting in the highest average kinetic energy of particles, while sample (iii) has the lowest temperature, resulting in the lowest average kinetic energy of particles.
If the three samples are all at the same temperature, the ranking with respect to total pressure would be: P(ii) > P(i) = P(iii). This is because the total pressure of a gas mixture is the sum of the partial pressures of each gas component, and sample (ii) has the highest partial pressure of each gas component, resulting in the highest total pressure.
With respect to partial pressure of helium, the ranking would be: P_He(iii) < P_He(ii) < P_He(i). This is because sample (iii) has the lowest partial pressure of helium, while sample (ii) has the highest partial pressure of helium.
For density, the ranking would be: d(ii) < d(i) < d(iii). This is because sample (ii) has the least number of particles per unit volume, resulting in the lowest density, while sample (iii) has the most number of particles per unit volume, resulting in the highest density.
Finally, with respect to average kinetic energy of particles, the ranking would be: E(i) > E(ii) > E(iii). This is because the average kinetic energy of particles is directly proportional to the temperature, and sample (i) has the highest temperature, resulting in the highest average kinetic energy of particles, while sample (iii) has the lowest temperature, resulting in the lowest average kinetic energy of particles.
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Step 4: Solve the equation.
KE = 27.5 kg x 4 m²/s2
=
A scientist suggests putting solar panels on homes to supply energy because it is usually sunny there. The amount of sun is BEST described as characteristic of which property of the area?
A. Weather
B. Climate
C. Food webs
D. Gravity
Answer:
the answer is a because if u have good wheather the panels will for no matter what
Why doesn't cloud formation take place until the dewpoint temperature is reached
Answer:
The moisture in the cloud affects the weather.
How did Thomson's experiment change Dalton's atomic model?
A. Thomson discovered that atoms changed properties when put in
an electric field.
B. Thomson discovered that atoms did not rearrange when forming
compounds.
C. Thomson discovered that atoms of one kind of element could
have different masses.
D. Thomson discovered that the atom contained smaller particles
called electrons.
Answer:
D. thomson discovered that the atom contains smaller particles called electrons
Thomson discovered that the atom contained smaller particles called electrons. The correct option is D.
What is Dalton's atomic model?Dalton proposed that all matter is composed of tiny indivisible particles known as atoms, which he envisioned as "solid, massy, hard, impenetrable, movable particle(s)."
Thomson's experiment altered Dalton's atomic model by revealing the existence of smaller particles known as electrons within the atom.
The first part of his theory states that all matter is made up of indivisible atoms. According to the second part of the theory, all atoms of a given element have the same mass and properties.
One of Dalton's most important contributions is that it does not violate several fundamental laws of chemical combination, including the law of definite proportions, the law of multiple proportions, and the law of conservation of mass.
Thus, the correct option is D.
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which of the following statements correctly describe standard electrode potentials? in what way must half-reactions and/or electrode potentials be manipulated when writing a balanced equation for a redox reaction? multiple select question. by convention, standard electrode potentials are quoted as reduction potentials. the half-reaction for the anode must be reversed when writing the balanced equation for the overall reaction. the sign for the anode potential must be reversed in order to to use the equation ecell
To accomplish this, the half-reaction with the smallest number of electrons may be multiplied. When writing the balanced equation, the half-reaction for the anode should be reversed to account for the oxidation occurring at the anode. Finally, to use the equation ecell, the sign of the anode potential must be reversed.
When answering questions on the Brainly platform, it is important to be factually accurate, professional, and friendly. One should be concise and avoid providing extraneous amounts of detail. Typos and irrelevant parts of the question should be ignored. The answer to the given question is as follows:By convention, standard electrode potentials are quoted as reduction potentials. The half-reaction for the anode must be reversed when writing the balanced equation for the overall reaction. The sign for the anode potential must be reversed to use the equation ecell.Standard electrode potentials are measured for half-reactions in their standard states, such as solutions of 1 mol/L and gases at a pressure of 1 atm. It indicates the ability of a half-reaction to accept electrons, with the half-reaction with the greatest reduction potential being the strongest oxidizing agent.When writing a balanced equation for a redox reaction, half-reactions and/or electrode potentials must be manipulated in order to balance the number of electrons transferred. Since the electrons must cancel out in the overall reaction, one half-reaction should be multiplied to match the number of electrons in the other half-reaction.
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Eric wants to make sure he understands the parts of a good scientific investigation. He knows that scientific investigations include many different steps. During a scientific investigation, which step occurs after a scientist collects data?
A:Draw conclusions
B:Form the hypothesis
C: Plan the experiment
D: Follow the procedure
Answer:
B. Form the hypothesis
Explanation:
After collecting data and observations, a scientist makes a hypothesis and plans an experiment to test said hypothesis.
Please help How many moles of a gas sample are in 5.0 L container at 215 K and 342 kPa(The gas constant is 8.31 L kPa/mol K) Round your answer to one decimal place and enter the number only with no units.
Answer
1.0 mol
Explanation
Given:
Volume, V = 5.0 L
Temperature, T = 215 K
Pressure, P = 342 kPa
The gas constant, R = 8.31 L kPa/mol K
What to find:
The number of moles of the gas sample.
Step-step-solution:
The number of moles of the gas can be determine using the ideal gas equation formula:
\(PV=nRT\)Put the given values into the formula and calculate for n:
\(\begin{gathered} 342\times5.0=n\times8.31\times215 \\ 1710=1786.65n \\ \text{Divide both sides by 1786.65} \\ \frac{1710}{1786.65}=\frac{1786.65n}{1786.65} \\ n=0.9571\text{ mol} \\ To\text{ one decimal place,} \\ n=1.0\text{ mol} \end{gathered}\)The number of moles of the gas sample is 1.0 mol.
Carbon films are a result of gases
evaporating and what being left behind?
A + B = AB
The greatest amount of AB would be produced if the equilibrium constant of the
reaction is equal to
A. 1.0 x 10-5
B. 1.0 x 10¹
C. 1.0 x 10-1
D. 1.0 × 105
I
The greatest amount of AB would be produced if the equilibrium constant of the reaction is equal to \(1.0 \;X \;10^5\). Hence, option D is correct.
What is an equilibrium constant?A number that expresses the relationship between the amounts of products and reactants present at equilibrium in a reversible chemical reaction at a given temperature.
The equilibrium constant expression is a mathematical relationship that shows how the concentrations of the products vary with the concentration of the reactants.
If the value of K is greater than 1, the products in the reaction are favoured. If the value of K is less than 1, the reactants in the reaction are favoured.
Hence, option D is correct.
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Complete and balance the molecular equation, including the phases, for the reaction of aqueous potassium sulfate, k2so4 , and aqueous strontium iodide, sri2.
The complete and balanced molecular equation is-
K₂SO₄(aq) + SrI₂(aq) → KI(aq)+ SrSO₄(s)
Both sides of the reaction must have an equal amount of atoms in each element to balance the equation.
What is a balanced chemical reaction?A balanced chemical reaction is one in which both the reactant and product sides of the reaction include an equal number of atoms from each of the constituent components. For the chemical equation to adhere to the Law of the conservation of mass, it must be balanced.An equation that has the same number of each type of atom on both sides of the arrow is said to represent a balanced chemical reaction. A chemical reaction is represented symbolically in writing by a chemical equation. The chemical(s) used as the reactant(s) are listed on the left and the chemical(s) used as the product(s) are listed on the right. A chemical reaction requires an equal number of atoms in the reactants and products because, according to the rule of conservation of mass, atoms cannot be generated or destroyed throughout the process.How to balance a molecular chemical equation?First of all, identify the most complicated or complex substances.If possible, start with that material and pick an element or elements that are present in only one reactant and one product. To get the same number of atoms of this element(s) on both sides, adjust the coefficients.If polyatomic ions are present on both sides of the chemical equation, they should be balanced as a whole.The remaining atoms are then balanced, typically ending with the substance that is the least complicated and, if necessary, employing fractional coefficients. In order to get whole numbers for the coefficients if a fractional coefficient was used, multiply both sides of the equation by the denominator.To learn more about Molecular equation click on-
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Balanced molecular equation is :
K₂SO₄(aq) + SrI₂(aq) → KI(aq)+ SrSO₄(s)
What is Balanced equation?
If both the reactants and the products of a chemical reaction have the same number of atoms and total charge, the equation for the reaction is said to be balanced. In other words, the mass and charge balances on both sides of the reaction are equal.The equation must be balanced so that each type of atom appears in equal amounts on both the left and right sides of the arrow. This is accomplished by altering the compounds' coefficients (numbers placed in front of compound formulas).In an imbalanced chemical equation, the reactants and products of a reaction are provided, but the amounts required to satisfy the conservation of mass are not given.Learn more about the balanced equation with the help of the given link:
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a reaction has a δhrxn = 23.25 kj and δs was 161.26 j/mol∙k. this reaction is spontaneous
The spontaneity of a reaction is determined by the Gibbs free energy change (∆G), which is a measure of the system's ability to do work.
The equation that links ∆G, ∆H, and ∆S is: ∆G = ∆H - T∆S, where T is the temperature in Kelvin and ∆H and ∆S are the enthalpy and entropy changes, respectively. The signs of ∆H and ∆S determine whether the reaction is exothermic or endothermic and whether it is entropy-driven or enthalpy-driven, respectively.
If ∆G is negative, the reaction is spontaneous, meaning it occurs without the input of energy.The given reaction has a ∆H of 23.25 kJ and a ∆S of 161.26 J/mol∙K.
First, we need to convert the units of ∆S from J/mol∙K to kJ/mol∙K by dividing by 1000.∆S = 161.26 J/mol∙K ÷ 1000 = 0.16126 kJ/mol∙K Substitute the values into the equation to determine the spontaneity of the reaction:
∆G = ∆H - T∆S∆G = (23.25 kJ) - (298 K) x (0.16126 kJ/mol∙K)∆G = 23.25 kJ - 48.02 kJ∆G = -24.77 kJ Since ∆G is negative, the reaction is spontaneous.
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please help asap (i just need B)
The final pressure of the reaction is found to be 49.81 torr and the half life of the decomposition of dimethyl ether is 1019.11 seconds.
The decomposition of dimethyl ether at 540 degrees Celsius is a first order reaction,
The relation between the initial pressure and final pressure in the first order reaction is,
-Kt = ln[P]/[Pₙ]
Where,
K is the rate constant,
P is the final pressure,
Pₙ is the final pressure,
t is the time period.
(a) the initial pressure is 135 torr, the rate constant K is 6.8 x 10⁻⁴ s⁻¹, time period is 1420 seconds,
Putting all the values in the formula,
-Kt = ln[P]/[Pₙ]
6.8 x 10⁻⁴ x 1420 = ln[135]/[Pₙ]
0.9656 = ln[135]/[Pₙ]
Here, 0.9656 ≈ 1, and e = 2.71
e¹ = 135/Pₙ
Pₙ = 135/2.17
Pₙ = 49.81 torr.
(b) The half life of a first order reaction is given by,
T = 0.693/K
Where,
T is the half life,
K is the rate constant,
Putting the values
T = 0.693/ 6.8 x 10⁻⁴
T = 1019.11 seconds.
So, half life is 1019.11 seconds.
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What type of reaction is this?
What is the temperature of 0. 750 mol of a gas stored in a 6,850 ml cylinder at 2. 21 atm? use p v equals n r t. And r equals 0. 0821 startfraction l times atmospheres over moles time k endfraction.
The temperature of the gas is approximately 374 K.
The temperature of a gas can be calculated using the formula \(PV = nRT\),
where \(P\) represents the pressure of the gas in atm,
\(V\) represents the volume of the gas in L (converted from mL by dividing by 1000),
\(n\) represents the number of moles of the gas,
\(R\) is the universal gas constant (0.0821 L·atm/mol·K), and
\(T\) represents the temperature of the gas in Kelvin.
Rearranging the equation, we have \(T = \frac{PV}{nR}\).
\(P = 2.21\) atm
\(V = 6.850\) mL = \(6.85\) L
\(n = 0.750\) mol
\(R = 0.0821\) L·atm/mol·K
Substituting the given values into the equation, we get:
\(T = \frac{(2.21 \, \text{atm}) \times (6.85 \, \text{L})}{(0.750 \, \text{mol}) \times (0.0821 \, \text{L·atm/mol·K})}\)
Calculating the expression, we find:
\(T \approx 374 \, \text{K}\)
Therefore, the temperature of the gas is approximately 374 K.
This calculation demonstrates the relationship between the pressure, volume, temperature, and amount of gas using the ideal gas law equation.
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Carbon dioxide is transported through the blood primarily as
a. dissolved gas.
b. bicarbonate.
c. carbonic anhydrase.
d. carbaminohemoglobin.
Carbon dioxide is transported through the blood primarily as bicarbonate. The correct answer is Option B.
What is the importance of carbon dioxide?Carbon dioxide (CO₂) is a colorless, odorless, and tasteless gas that is one of the most critical compounds on the planet. It is the waste product of respiration and is also produced by burning fossil fuels such as coal, oil, and gas.
Carbon dioxide (CO₂) is important for maintaining the body's acid-base balance. Carbon dioxide is converted to bicarbonate in the blood and transported to the lungs for expulsion by the respiratory system.
Therefore, it can be inferred that Carbon dioxide is transported through the blood primarily as bicarbonate.
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what will be observed when a piece of Ag metal is added to a Pb(NO3)2 solution?
What will be observed when a piece of Ca metal is added to a AgNO3 solution?
Answer:
Part a)
No Reaction
Part b)
CaNO3 is formed
Explanation:
Part a)
Silver is less reactive than lead and hence when Ag metal is added to a Pb(NO3)2 solution there will be no reaction
Ag (s) + Pb(NO3)2 (aq) --> Ag (s) + Pb(NO3)2 (aq)
Part b)
Calcium is more reactive than silver and hence when calcium is added to the solution of AgNO3, it will replace Ag from the AgNO3 and itself form compound with NO3 2- ion.
The reaction for the same is
Ca (s) + AgNO3 = CaNO3 + Ag (s)
A balloon is filled with 94.2 grams of an unknown gas. the molar mass of the gas is 44.01 gmol. how many moles of the unknown gas are present in the balloon?
To determine the number of moles of the unknown gas present in the balloon, we can use the formula:
Number of moles = Mass of the gas / Molar mass of the gas
In this case, the mass of the gas is given as 94.2 grams and the molar mass is given as 44.01 g/mol. Substituting these values into the formula, we can calculate the number of moles:
Number of moles = 94.2 g / 44.01 g/mol
The result will give us the number of moles of the unknown gas present in the balloon.
The formula to calculate the number of moles is derived from the concept of molar mass, which is the mass of one mole of a substance.
By dividing the mass of the gas by its molar mass, we can determine how many moles of the gas are present. In this case, dividing 94.2 grams by 44.01 g/mol gives us the number of moles of the unknown gas in the balloon.
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6. You have a sample of H2Ois, with a mass 23.0 grams at a temperature of 46.0
temperature water would be in what state? Use reference table on page 492 for specific heat
capacity of ice). How many kilojoules of heat energy are necessary to carry out each step? Also
calculate the total amount of energy needed.
a) heat the ice to 0.0 °C?
Answer: I think it would be -23
Explanation:
1/2 of an oxygen atom can combine with 2/3 of a hydrogen atom true or false
The statement "1/2 of an oxygen atom can combine with 2/3 of a hydrogen atom" is false because Atoms are the basic building blocks of matter and cannot be divided into smaller parts without breaking down the atom's structure.
An oxygen atom is composed of 8 protons, 8 neutrons, and 8 electrons, and it is not possible to divide an oxygen atom into halves. Similarly, a hydrogen atom consists of 1 proton, 1 electron, and 0 or 1 neutron, and it cannot be divided into thirds.
When atoms combine to form molecules, they do so in specific ratios determined by their chemical properties.
In the case of oxygen and hydrogen, the most common combination is two hydrogen atoms and one oxygen atom, which combine to form a water molecule (\(H_2O\)). This is because the outer electron shells of the oxygen atom and the hydrogen atoms can interact in a way that stabilizes the resulting molecule.
Therefore the given statement is false
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