1. The formula of the hydrate is FePO₄•4H₂O
2. The name of the hydrate is Iron(iii) phosphate tetrahydrate.
1. Determination of the formula of the hydrate
H₂O = 32.3%FePO₄ = 67.7%Formula =?The formula of the hydrate can be obtained as follow:
Divide by their molar mass
H₂O = 32.3 / 18 = 1.794
FePO₄ = 67.7 / 151 = 0.448
Divide by the smallest
H₂O = 1.794 / 0.448 = 4
FePO₄ = 0.448 / 0.448 = 1
Therefore, the formula of the hydrate is FePO₄•4H₂O
The name of the hydrate is Iron(iii) phosphate tetrahydrate
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use the periodic table, to determine which of the following ions has a noble-gas electron arrangement:use the periodic table, to determine which of the following ions has a noble-gas electron arrangement: ti4 cr2 zn2 mn2
The ions has the noble - gas electron arrangement. The following ions has a noble gas electron arrangement is Ti⁴⁺ .
The atomic number of the titanium is 22. The symbol of the titanium is Ti.
The electronic configuration of Ti is as follows :
Electronic configuration : 1s² 2s² 2p⁶ 3s² 3p⁶ 3d² 4s² or [Ar] 3d² 4s²
The Ti⁴⁺ means the titanium losses the four electrons and form the positively charged ion called as cation.
The electronic configuration of Ti⁴⁺ is as follows :
Electronic configuration : 1s² 2s² 2p⁶ 3s² 3p⁶ or [Ar]
Thus, the Ti⁴⁺ ions has a noble gas electron arrangement.
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When you add baking soda to vinegar, the mixture fizzes as carbon dioxide gas is produced. Suppose you added water to vinegar before you mixed it with the baking soda. Why will the rate of carbon dioxide production decrease?
Answer:
because the water would diloute the chemicals in the vinegar
Explanation:
The irreversible isomerization A
B was carried out in a batch reactor and the following concentration time data were obtained:
Time vs Concentration data in a Batch reactor
t 0 3 5 8 10 12 15 7.5
mol/h 4 2.89 2.25 1.45 1.0 0.65 0.25 0.07
Determine the reaction order,
, and the specific reaction a rate constant, k, using any method of your choice.
The reaction order and specific reaction rate constant can be determined by performing the kinetics experiment on irreversible polymerization A. Kinetic experiments can be used to investigate the rate and mechanism of chemical reactions. Chemical kinetics is the study of chemical reactions' speed and pathway.
The term "kinetics" refers to the study of reaction rates, which are determined by measuring the concentration of reactants and products as a function of time.Kinetics experiments can be used to determine the reaction rate and order of reaction. A chemical reaction's rate is defined as the change in the concentration of a reactant or product per unit time. The order of a reaction refers to the number of molecules that must react to produce a product. The order of reaction can be determined by measuring the initial rate of the reaction as a function of concentration.Methods for determining the reaction rate order include the initial rate method, the half-life method, and the integrated rate method. The initial rate method determines the reaction order by measuring the initial rate of the reaction at different reactant concentrations. The half-life method determines the reaction order by measuring the time it takes for the reactant concentration to decrease by half.The integrated rate method determines the reaction order by measuring the concentration of the reactant or product at different times.The specific rate constant can be determined by using the Arrhenius equation, which relates the rate constant to the activation energy, temperature, and frequency factor. The frequency factor can be determined by measuring the rate constant at different temperatures.For such more question on polymerization
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how many grams of Fe are produced from 92.5g of FeO given the following reaction
The mass(in grams) of iron, Fe produced from the 92.5g of iron (ii) oxide, FeO is 71.9 grams
How do i determine the mass of Fe produced?The mass of Fe produced from the 92.5g of iron (ii) oxide, FeO can be obtained as follow:
2FeO → 2Fe + O₂
Molar mass of FeO = 71.85 g/molMass of NH₃ from the balanced equation = 2 × 71.85 = 143.7 g Molar mass of Fe = 55.85 g/molMass of Fe from the balanced equation = 2 × 55.85 = 111.7 gFrom the balanced equation above,
143.7 g of FeO reacted to produce 111.7 g of Fe
Therefore,
92.5 g of Fe will react to produce = (92.5 × 111.7) / 143.7 = 71.9 g of Fe
Thus, the mass of Fe produced from the reaction is 71.9 grams
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Complete question:
How many grams of Fe are produced from 92.5 g of FeO given the following reaction 2FeO → 2Fe + O₂
Which hypothesis is most supported by astronomers?
A- The universe is currently expanding and will continue to expand.
B- Stars could burn out, causing the universe to become dark and cold.
C- Gravity could pull galaxies back together, causing a reverse of the big bang.
D- Dark energy will pull the universe together to form a massive black hole.
HURRY!!
Answer:
option A is the most supported hypothesis by astronomers
Solid iron pellets are heated, melted and drawn into wires. This is an example of a chemical reaction.
O True
O False
Answer:
False
Explanation:
A change of state is not an example of a chemical reaction.
A chemical reaction cannot be reversed. This example however, can be. You can melt the wire down and them form it back into iron pellets
Answer:
False
Explanation:
The key to a chemical reaction is "irreversible change". If you can change it back to what it was before, it's not a chemical reaction. This is an example of a physical change.
A doorknob makes it easier for you to open doors because it is what type of simple machine?
Answer: Wheel and Axle
Both of these work together to form a simple machine. You can't have one without the other.
If you try to turn just the axle itself, then you'll find it takes a lot of work. This is because the inertia of the axle wants to keep the object at rest. Also, you won't have a lot of torque due to the small radius compared to what a doorknob can offer.
Using a doorknob is like putting a (steering) wheel on an axle. This increases the radius and therefore increases the torque. You put in less work into the system and get more out of it.
Calcium hydroxide and hydrogen gas are produced by reaction of calcium hydride and water
Answer:
The reaction between calcium hydride (CaH2) and water (H2O) can be described by the following equation:
CaH2 + 2H2O → Ca(OH)2 + 2H2
This reaction produces calcium hydroxide (Ca(OH)2) and hydrogen gas (H2). The number of fluorine atoms is not specified in this equation.
Explanation:
Who knows and who doesn't know and who knows and who doesn't know and who knows because I thought that no one would even be happy to answer you
what is the frequency in herts of an xray having wavelength of 4.73 x 10-14 hectometers to 3 significant figures?
The frequency (in hertz) of the x-ray having a wavelength of 4.73×10⁻¹⁴ hectometers is 6.34×10¹⁹ Hertz
How do I determine the frequency of the x-ray?Frequency is defined as the number of complete oscillations made in 1 second.
However, the frequency of a wave is related to wavelength according to the following formula:
Velocity (v) = wavelength (λ) × frequency (f)
v = λf
With the above formula, we can determine the frequency of the x-ray. Details below:
Wavelength (λ) = 4.73×10⁻¹⁴ hectometers = 4.73×10⁻¹⁴ × 10² = 4.73×10⁻¹² metersSpeed of x-ray (v) = 3×10⁸ m/sFrequency (f) =?Velocity (v) = wavelength (λ) × frequency (f)
3×10⁸ = 4.73×10⁻¹² × frequency
Divide both sides by 4.73×10⁻¹²
Frequency = 3×10⁸ / 4.73×10⁻¹²
Frequency = 6.34×10¹⁹ Hertz
Thus, we can conclude, the frequency is 6.34×10¹⁹ Hertz
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reddit mcat In a titration, 27.4 mL of a 0.0154 M solution of Ba(OH)2 is needed to neutralize 20.0 mL of HCl. What was the concentration of the acid solution
Answer:
0.422 M
Explanation:
Equation of the reaction,
2HCl(aq) + Ba(OH)₂(aq) ⇒ BaCl₂(aq)+2H₂O(l)
From the recation above,
2 moles of HCl is needed to neutralize 1 mole of Ba(OH)₂.
Using,
C'V'/CV = a/b......................... Equation 1
Where C' = concentration of acid, C = concentration of base, V' = volume of acid, V = volume of base, a = number of moles of acid, b = number of moles of base.
make C' the subject of the equation.
C' = aCV/bV'................. Equation 2
a = 2 mole, b = 1 mole, C = 0.0154 M, V = 27.4 mL, V' = 20 mL
Substitute into equation 2
C' = (2×0.0154×27.4)/(1×20)
C' = 0.422 M.
Hence the concentration of acid is 0.422 M
The ability for an pond to freeze over in the winter
Answer:
The ability for a pond to freeze over in the winter is a physical property.
Where does the oil in cars come from?
Select 2 that apply
-Phytoplankton convert the sugar created through photosynthesis into oil.
-Coral Reefs clean the water by removing any carbon waste, they then convert this into oil.
-Every time there is an earthquake, oil is being produced and new oil deposits are created.
-The phytoplankton that is dead become liquefied over time due to pressure, and oil deposits
are formed.
-Fish produce oil as a waste product that eventually forms oil deposits.
- The phytoplankton that is dead become liquefied over time due to pressure, and oil deposits are formed.
- Fish produce oil as a waste product that eventually forms oil deposits.
A 20.0-mL sample of 0.115 M sulfurous acid (H2SO3) solution is titrated with 0.1014 M KOH. At what added volume of base solution does each equivalence point occur
Answer:
Explanation:
20mL = 0.020L
0.115M = mol/0.02L
mol=0.0023
equivalence point → mols of weak acid = mols of strong base
0.1014 = 0.0023/volume
volume = 0.02268 L → 22.68 mL
To know the end point we use phenolphthalein as indicator. End point is a point where completion of reaction happen. Therefore, volume of base is 22.6ml.
What is titration?Titration is a technique by which we know the concentration of unknown solution using titration of this solution with solution whose concentration is known.
The balanced equation between sulfurous acid and potassium hydroxide.
KOH + H₂SO\(_3\) →K\(_2\)SO\(_4\) +H\(_2\)O
concentration of sulfurous acid= 0.115 M
Volume of sulfurous acid= 20.0-mL
Concentration of potassium hydroxide=0.1014 M
Volume of potassium hydroxide= ?
At equivalent point,
moles of H₂SO\(_3\) moles of KOH
M₁×V₁=M₂×V₂
0.115 M×20.0-mL = 0.1014 M×V₂
V₂=22.6ml
Therefore, volume of base is 22.6ml.
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How many alkyl substituents does N-ethyl-N-methylaniline have?
one
two
O three
o eight
none
Answer:
Two.
Explanation:
Hello!
In this case, considering the attached picture wherein you can see the presence of the parent chain as aniline, we can see radicals at the nitrogen, named by N-ethyl and N-methyl which are the present alkyl substituents. In such a way, the benzene ring is not considered an alkyl radical because it belongs to the parent chain on aniline and therefore, N-ethyl-N-methylaniline has two alkyl substituents.
Best regards!
There are two alkyl substituents attached to the nitrogen; one ethyl and one methyl group
Aniline consists of a benzene ring to which an -NH2 moiety is attached. Usually, it is possible for the any of the two hydrogen atoms in the -NH2 moiety to become substituted leading to N-alkylated product.
In the compound N-ethyl-N-methylaniline, there are two alkyl substituents attached to the nitrogen; one ethyl and one methyl group as shown in the image attached to this answer.
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how many liters of O2 are needed to produce 5.62 g of SO2 in the following reaction? 4FeS2+11O2 ->2Fe2O3+8SO2
8moles of SO_2 need 11mol O_2
1mol need=11/8=1.4molO_2Moles of sO_2
\(\\ \rm\hookrightarrow \dfrac{5.62}{64}=0.1\)
So
Moles of O_2
1.4(0.1)=0.14molWe know
1mol at STP=22.4L1.4mol=0.14(22.4)=3.13L O_2Study the balanced chemical equations for the reactions of methane (CH4) with oxygen and hydrogen with oxygen.
Methane is the main component of fossil fuels such as natural gas.
CH4 + 202 - CO2 + 2H20 + energy
2H2 + O2 + 2H2O + energy
What product of the reaction of methane has an impact on the environment?
Answer:
CO2 (Carbon Dioxide) has a negative impact on environment.
Explanation:
CO2 is a product of combustion of Methane
The carbon dioxide product of the reaction of methane includes an influence on the environment. So, not only does methane contribute to global warming instantly but even, indirectly via the release of carbon dioxide.
What are the harmful causes of methane?As methane exists emitted into the air, it responds in several dangerous ways. It predominantly leaves the atmosphere through oxidization, comprising water vapor and carbon dioxide. Methane inhalation can result in mood modifications, slurred speech, vision problems, memory loss, nausea, vomiting, facial flushing, and headache. In severe cases, there may be differences in breathing and heart rate, balance concerns, numbness, and unconsciousness.
Hence, The carbon dioxide product of the reaction of methane includes an influence on the environment. So, not only does methane contribute to global warming instantly but even, indirectly via the release of carbon dioxide.
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3. Which of the elements listed below would you expect to form ions with a positive one charge?
Chlorine
Lithium
Sodium
Magnesium
Answer:
Lithium and Sodium
Explanation:
What is the energy of light with frequency equal to 4.3 x 10^10 s^-1?
Answer:
\(E=2.85\times 10^{-23}\ J\)
Explanation:
Given that,
The frequency of light, \(f=4.3\times 10^{10}\ Hz\)
We need to find the energy of light. The formula for the energy is given by :
\(E=hf\) Where h is Planck's constant
Putting all the values of h and f, we get :
\(E=6.63\times 10^{-34}\times 4.3\times 10^{10}\\\\E=2.85\times 10^{-23}\ J\)
So, the energy of light is \(2.85\times 10^{-23}\ J\).
Mercury, also known as quicksilver, is a metallic element and a liquid at room temperature. Calculate mercury's density if a sample of mercury is found to have a mass of 685.0685.0 g and a volume of 51.3951.39 mL. density: g/mL
Answer:
13.33g/mL is mercury's density
Explanation:
The density of a substance is defined as the ratio between the mass of the substance and the space that occupy. We can express the density of mercury in g/mL:
Grams mercury: 685.0g
Volume = 51.39mL
That means the density of the mercury is:
685.0g / 51.39mL
13.33g/mL is mercury's densityCalculate the mole fraction of each solute and solvent in the solution of 46.85 g of codeine, C 18 H 21 NO 3 , in 125.5 g of ethanol, C 2 H 5 OH.
mol fraction Codein : 0.054
mol fraction Ethanol : 0.946
Further explanationGiven
46.85 g of codeine
125.5 g of ethanol
Required
mol fraction
Solution
The mole fraction : the mole ratio of a substance to the mole of solution /mixture
mol Codeine, C₁₈H₂₁NO₃(MW=299.4 g/mol) :
\(\tt mol=\dfrac{46.85}{299.4 g/mol}\\\\mol=0.1565\)
mol Ethanol, C₂H₅OH(MW=46.07 g/mol)
\(\tt mol=\dfrac{125.5}{46.07}=2.7241\)
mol of solution :
\(\tt mol~codein+mol~ethanol=0.1565+2.7241=2.8806\)
mol fraction Codein :\(\tt \dfrac{0.1565}{2.8806}=0.054\)
mol fraction Ethanol :
\(\tt \dfrac{2.7241}{2.8806}=0.946\)
What Celsius temperature, T2 , is required to change the volume of the gas sample in Part A ( T1 = 35 ∘C , V1 = 1260 L ) to a volume of 2520 L ? Assume no change in pressure or the amount of gas in the balloon.
70 degree celsius
Explanations:According to Charle's law, the volume of a given mass of gas is directly proportional to absolute temperature provided that the pressure is constant. Mathematically;
\(\begin{gathered} v\alpha T \\ v=kT \\ k=\frac{v_1}{T_1}=\frac{v_2}{T_2} \end{gathered}\)where
v1 and v2 are the initial and final volume respectively
T1 and T2 are the initial and final temperature respectively
Given the following parameters
\(\begin{gathered} v_1=1260L \\ v_2=2520L \\ T_1=35^0C \end{gathered}\)Required
Final temperature T2
Substitute the given parameters into the formula to have:
\(\begin{gathered} T_2=\frac{v_2T_1}{v_1} \\ T_2=\frac{2520\times35}{1260} \\ T_2=70^0C \end{gathered}\)Hence the celsius temperature T2 required is 70 degree celsius
Starting with 0.3500 mol CO(g) and 0.05500 mol COCl2(g) in a 3.050 L flask at 668 K, how many moles of CI2(g) will be present at equilibrium? CO(g) + Cl2(8)》COCl2(g)
Kc= 1.2 x 10^3 at 668 K
At equilibrium, the number of moles of Cl2(g) present is approximately 347.37 mol.
To determine the number of moles of Cl2(g) at equilibrium, we need to use the given equilibrium constant (Kc) and set up an ICE table to track the changes in the reactants and products.
The balanced equation for the reaction is:
CO(g) + Cl2(g) ⇌ COCl2(g)
Let's set up the ICE table:
CO(g) + Cl2(g) ⇌ COCl2(g)
Initial: 0.3500 0.05500 0
Change: -x -x +x
Equilibrium: 0.3500 - x 0.05500 - x x
Using the equilibrium concentrations in the ICE table, we can write the expression for the equilibrium constant (Kc) as:
Kc = [COCl2(g)] / [CO(g)][Cl2(g)]
Substituting the values into the equation, we have:
1.2 × 10^3 = (0.05500 - x) / [(0.3500 - x)(0.05500 - x)]
Simplifying the equation, we can cross-multiply and rearrange:
1.2 × 10^3 × (0.3500 - x)(0.05500 - x) = 0.05500 - x
Expanding and rearranging, we get:
0 = (1.2 × 10^3 × 0.05500 - 1.2 × 10^3x + 0.05500x) - x
Simplifying further:
0 = 66 - 1.245x + 0.05500x - x
0 = 66 - 0.19x
0.19x = 66
x = 66 / 0.19
x ≈ 347.37
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write the structural formula for 2-bromo-3-chloro-4,4-dimethylpentanal
Answer:
Br-CH2-CH(CH3)2-C(Cl)H-CH(CH3)2-CHO
Explanation:
The molecule has a total of 14 carbon atoms, 13 hydrogen atoms, and 1 bromine atom. The carbon atoms are arranged in a chain with a methyl group attached to the second carbon atom, a chlorine atom attached to the third carbon atom, and two methyl groups attached to the fourth carbon atom. The fifth carbon atom has a carbonyl group attached to it.
The molecule is an aldehyde, which means that it has a carbonyl group (C=O) at the end of the chain. The carbonyl group is polar, and the oxygen atom has a partial negative charge. The hydrogen atom has a partial positive charge. This polarity makes the aldehyde group susceptible to nucleophilic attack.
The bromine and chlorine atoms are both electrophilic, which means that they have a partial positive charge. This makes them susceptible to nucleophilic attack.
The methyl groups are non-polar and do not have any significant reactivity.
The molecule is a chiral molecule, which means that it has a mirror image that is not superimposable on itself. This is because the carbon atom with the carbonyl group is attached to four different groups.
The molecule is a liquid at room temperature and has a strong odor. It is used in a variety of products, including perfumes, flavorings, and plastics.
I really need to pass chem, someone please help me! <3
Which seasons in Atlanta GA have worst AQI
In Atlanta, GA, certain seasons are associated with poorer air quality due to various factors such as weather conditions, human activities, and geographical location.
Typically, the seasons with the worst AQI in Atlanta, GA, are summer and early fall. This is primarily due to the combination of high temperatures, stagnant air masses, and increased pollution from various sources.
During the summer months, Atlanta experiences hot and humid weather, which can contribute to the formation of ground-level ozone. Ozone is a harmful pollutant that is created when pollutants from vehicles, power plants, and industrial activities react with sunlight and heat. High levels of ozone can cause respiratory issues and other health problems.
In addition to ozone, Atlanta also experiences increased levels of particulate matter (PM) during the summer and early fall. PM refers to tiny particles suspended in the air, which can come from sources such as vehicle exhaust, industrial emissions, and wildfires.
These particles can be inhaled into the lungs and can have detrimental effects on respiratory health.
It's important to note that air quality can vary from year to year and is influenced by various factors. Local regulations, weather patterns, and changes in pollutant emissions can all impact the AQI during different seasons.
Monitoring air quality reports and taking necessary precautions such as reducing outdoor activities during times of poor air quality can help individuals stay informed and protect their health.
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Which of the following is an example of a molecule? A. Cl(chlorine) B. HCl (hydrochloric acid) C. Hydrogen D. Bromine
Answer:
hydrogen
Explanation
a molecule of hydrogen is the simplest possible molecule . its consists of two protons and two electrons heid together by electrostatic forces. like atomic hydrogen the assemblage can exist in a number of energy levels
Choose the equation below that is balanced correctly.
S8 +24 028 SO3
S8+ 12 0₂8 SO3
6 S8+8 026 SO3
2 S8 +3 022 SO3
The balanced equation for the reaction between sulfur (S₈) and oxygen (O₂) to form sulfur trioxide (SO₃) is 2S₈ + 16O₂ → 16SO₃.
What is the balanced chemical equation?Balancing chemical equations involves the addition of stoichiometric coefficients to the reactants and products.
The balanced equation for the reaction between sulfur (S₈) and oxygen (O₂) to form sulfur trioxide (SO₃) is determined as;
2S₈ + 16O₂ → 16SO₃
From the reactants side we can see that sulfur is 16 and also 16 in the product side. The number of oxygen in the reactant side is 32 and also 32 in the product side.
Thus, the balanced equation for the reaction between sulfur (S₈) and oxygen (O₂) to form sulfur trioxide (SO₃) is 2S₈ + 16O₂ → 16SO₃.
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Below is a list of the first 10 residues of the B helix in myoglobin from different organisms.
Position 1 2 3 4 5 6 7 8 9 10
Human D I P G H G Q E V L
Chicken D I A G H G H E V L
Alligator K L P E H G H E V I
Turtle D L S A H G Q E V I
Tuna D Y T T M G G L V L
Carp D F E G T G G E V L
Based on this information, which positions (a) appear unable to tolerate substitutions, (b) can tolerate conservative substitution, and (c) are highly variable?
Answer:
i dont knoiwxplanation:
A sample of ammonia, NH3, has a mass of 78.25 g. Calculate the number of ammonia molecules in the sample.
number of molecules:
There are approximately \(2.76 * 10^{24\) ammonia molecules in the given sample.
To calculate the number of ammonia molecules in the sample, we need to use Avogadro's number and the molar mass of ammonia.
The molar mass of ammonia \((NH_3)\) can be calculated by adding up the atomic masses of nitrogen (N) and hydrogen (H):
Molar mass of \(NH_3\) = (1 x atomic mass of N) + (3 x atomic mass of H)
= (1 x 14.01 g/mol) + (3 x 1.01 g/mol)
= 14.01 g/mol + 3.03 g/mol
= 17.04 g/mol
Now, we can calculate the number of moles of ammonia in the sample using the formula:
Number of moles = Mass of the sample / Molar mass
Number of moles = 78.25 g / 17.04 g/mol
≈ 4.5865 mol (rounded to four decimal places)
Finally, we can use Avogadro's number, which represents the number of particles (atoms, molecules, etc.) in one mole of a substance. Avogadro's number is approximately \(6.022 * 10^{23\) particles/mol.
Number of ammonia molecules = Number of moles x Avogadro's number
Number of ammonia molecules ≈ 4.5865 mol x (\(6.022 * 10^{23\) molecules/mol)
≈ \(2.76 * 10^{24\) molecules (rounded to two significant figures)
Therefore, the provided sample contains roughly \(2.76 * 10^{24\) ammonia molecules.
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The number of ammonia molecules in the sample is approximately 2.764 x \(10^{24}\) molecules.
To calculate the number of ammonia molecules in a given sample, we need to use Avogadro's number and the molar mass of ammonia.
The molar mass of ammonia (NH3) is calculated as follows:
Molar mass of N = 14.01 g/mol
Molar mass of H = 1.01 g/mol
Total molar mass of NH3 = 14.01 g/mol + (3 * 1.01 g/mol) = 17.03 g/mol
Now, we can calculate the number of moles of ammonia in the sample:
Number of moles = Mass of sample / Molar mass of NH3
Number of moles = 78.25 g / 17.03 g/mol = 4.594 moles
Next, we use Avogadro's number, which states that there are 6.022 x \(10^{23}\) molecules in one mole of a substance.
Number of molecules = Number of moles * Avogadro's number
Number of molecules = 4.594 moles * 6.022 x \(10^{23}\) molecules/mol = 2.764 x \(10^{24}\) molecules
Therefore, there are approximately 2.764 x \(10^{24}\) ammonia molecules in the given sample of 78.25 g.
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A compound has two elements, A and B with electronegativities of 0.8 and 3.0 respectively. If the compound has a formula of A2B, which statement describes the bonding best? Group of answer choices The compound is largely ionic with A as the anion. The AB bond is largely covalent with a δ- on A. The compound is largely ionic with A as the cation. The AB bond is largely covalent with a δ+ on A.
Answer:
The compound is largely ionic with A as the cation.
Explanation:
A chemical bond is usually formed between two or more elements. A chemical bond may be ionic, covalent or polar covalent depending on the electro negativity difference between the atoms in the bond.
A large electro negativity difference usually implies an ionic bond. As a rule, when the electronegativity difference is greater than 2.0, the bond is considered ionic.
For the compound A2B, the electro negativity difference between the two atoms is about 2.2. This implies that A2B must be an ionic compound in which A is the cation and B is the anion.