CHEMISTRY HIGH SCHOOL

What is the percent composition by mass of nitrogen in (NH4)2CO3 (gram-formula mass = 96.0 g/mol)? (1) 14.6%
(2) 29.2%
(3) 58.4%
(4) 87.5%

Answers

Answer 1
Answer:

The percentage composition by mass of nitrogen in {\left( {{\text{N}}{{\text{H}}_{\text{4}}}} \right)_{\text{2}}}{\text{C}}{{\text{O}}_{\text{3}}} is \boxed{\left( 2 \right){\text{ 29}}{\text{.2 \% }}}.

Further explanation:

The most commonly applied concentration terms are as follows:

1. Molality

2. Mole fraction

3. Molarity

4. Parts per million

5. Mass percent

6. Volume percent

7. Percentage composition

The given compound is {\left( {{\text{N}}{{\text{H}}_{\text{4}}}} \right)_{\text{2}}}{\text{C}}{{\text{O}}_{\text{3}}}. It contains two atoms of nitrogen, eight atoms of hydrogen, one atom of carbon and three atoms of oxygen.

The mass of nitrogen in {\left( {{\text{N}}{{\text{H}}_{\text{4}}}} \right)_{\text{2}}}{\text{C}}{{\text{O}}_{\text{3}}} can be calculated as follows:

{\text{Mass of N}} =\left( {{\text{Number of nitrogen atoms}}} \right)\left( {{\text{Molar mass of nitrogen}}} \right)              …… (1)

The number of N atoms in {\left( {{\text{N}}{{\text{H}}_{\text{4}}}} \right)_{\text{2}}}{\text{C}}{{\text{O}}_{\text{3}}} is 2.

The molar mass of nitrogen is 14.01 g/mol.

Substitute these values in equation (1).

 \begin{aligned}{\text{Mass of nitrogen}} &= \left( {\text{2}} \right)\left( {{\text{14}}{\text{.01 g/mol}}} \right)\n&= 28.02{\text{ g/mol}}\n\end{aligned}

The formula to calculate the percentage composition of N in {\left( {{\text{N}}{{\text{H}}_{\text{4}}}} \right)_{\text{2}}}{\text{C}}{{\text{O}}_{\text{3}}} is as follows:

{\text{\%  composition of N}} = \left( {\frac{{{\text{Mass of N}}}}{{{\text{Mass of }}{{\left( {{\text{N}}{{\text{H}}_{\text{4}}}} \right)}_{\text{2}}}{\text{C}{{\text{O}}_{\text{3}}}}}} \right){\text{100 \% }}                                       …… (2)

The mass of N is 28.02 g/mol.

The mass of {\left( {{\text{N}}{{\text{H}}_{\text{4}}}} \right)_{\text{2}}}{\text{C}}{{\text{O}}_{\text{3}}} is 96.0 g/mol.

Substitute these values in equation (2).

\begin{aligned}{\text{\%  composition of N}} &= \left( {\frac{{{\text{28}}{\text{.02 g/mol}}}}{{{\text{96}}{\text{.0 g/mol}}}}} \right){\text{100 \% }}\n&= {\text{29}}{\text{.1875 \% }} \n &\approx {\text{2}}{\text{.92 \%}}\n\end{aligned}  

Therefore the percentage composition by mass of nitrogen in {\left( {{\text{N}}{{\text{H}}_{\text{4}}}} \right)_{\text{2}}}{\text{C}}{{\text{O}}_{\text{3}}} is 29.2 %.

Learn more:

  1. Calculate the moles of chlorine in 8 moles of carbon tetrachloride: brainly.com/question/3064603
  2. What is the concentration of alcohol in terms of molarity? brainly.com/question/9013318  

Answer details:

Grade: Senior School

Chapter: Concentration terms

Subject: Chemistry

Keywords: (NH4)2CO3, N, nitrogen, mass, 2.92 %, 96.0 g/mol, 28.02 g/mol, nitrogen, hydrogen, carbon, oxygen, mass of N, mass of (NH4)2CO3.

Answer 2
Answer:

The % composition of nitrogen is 29.166% ~ 29.2%. Thus option 2 is correct.

The percent composition of nitrogen in ammonium carbonate can be calculated as:

% Composition = \rm (mass\;of\;element)/(mass\;of\lcompound)\;*\;100

Mass of nitrogen in the compound has been:

Number of Nitrogen atoms = 2

Mass of 1 nitrogen atom = 14 g/mol

Mass of 2 nitrogen atom = 28 g/mol

Mass of compound = 96 g/mol

% Composition of nitrogen = \rm (28)/(96)\;*\;100

% Composition of nitrogen = 29.166 %

The % composition of nitrogen is 29.166% ~ 29.2%. Thus option 2 is correct.

For more information about the percent composition, refer to the link:

brainly.com/question/17505281

Related Questions

Which molecule, when added to a solution, would give the solution the highest pH?HCl H2SO4 KOH H2O
Neptunium's only naturally occurring isotope, 23793np, decays by emitting one alpha particle, one beta particle, and one gamma ray. What is the new atom formed from this decay?
What element has 3 electrons in its Lewis dot structure and is in the 2p orbital
Because of the atomic structure of carbon, it tends to form
Which term identifies a type of nuclear reaction?A) transmutationB) neutralizationC) depositionD) reduction

Which metal has no reaction with dilute hydrochloric acid or hydrochloric acid and forms a black oxide

Answers

Answer:

lead

Explanation:

lead have no reaction with Hcl unlike aluminum,zinc, magnesium... and it forms a black oxide

What word is not associated with Exothermic? A)absorbs energy B )burning firewood C )freezing water D) releases energy

Answers

Answer:

C

Explanation:

Answer:

D

Explanation:

Not a because the term exo means outward, so exothermic means releasing energy so D.

Not B or C because they have nothing to do with exothermic (exo- outward thermic- energy)

Where do decomposers fit on the pyramid of trophic levels?

Answers

Answer:

we place the decomposers in a special place along the side of the pyramid

Explanation:

example best shows that the chemistry of water is helpful to plants? Water’s polarity produces a high density, which allows water to move to the leaves. Water’s bent shape causes a slow passage of nutrients up to the leaves of plants. Water’s polarity causes cohesion that pulls other water molecules up through a plant. Water’s bent shape reduces its own passage through the cell membranes of roots.

Answers

The right answer for the question that is being asked and shown above is that: "Water’s polarity produces a high density, which allows water to move to the leaves." Example best shows that the chemistry of water is helpful to plants is that Water’s polarity produces a high density, which allows water to move to the leaves.

Answer:   Water’s polarity causes cohesion that pulls other water molecules up through a plant.

Which is the correctly balanced chemical equation for the reaction of KOH and H2SO4?

Answers

The answer should be 2KOH+H2SO4 ---> K2SO4+2H2O.
I hope this helps!!

Which best describes is the ∆G, ∆H, ∆S and T of a forest fire?

Answers

Below are the choices and the answer is C. 

A. ∆G=negative, ∆H= positive, ∆S= positive, T = large 
B. ∆G=positive, ∆H= positive, ∆S= positive, T = large 
C. ∆G=negative, ∆H= negative, ∆S= positive, T = large 
D. ∆G=negative, ∆H= positive, ∆S= negative, T = large 
E. ∆G=positive, ∆H= positive, ∆S= negative, T = large

Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.
Other Questions
What particle is emitted in alpha radiation
1.94 grams of magnesium to moles
24 kWh lithium-ion (Li-ion) battery with 84 mile rangeWhat does this mean??I'm doing research on a car, and I have NO clue what this is!
Why do scientific ideas change?