How Is The Molar Mass Of A Substance Determined?

Approved & Edited by ProProfs Editorial Team

The editorial team at ProProfs Quizzes consists of a select group of subject experts, trivia writers, and quiz masters who have authored over 10,000 quizzes taken by more than 100 million users. This team includes our in-house seasoned quiz moderators and subject matter experts. Our editorial experts, spread across the world, are rigorously trained using our comprehensive guidelines to ensure that you receive the highest quality quizzes.

Learn about Our Editorial Process

| By Kwchiro

Kwchiro

Community Contributor

Quizzes Created: 40 | Total Attempts: 356,869

Questions: 5 | Attempts: 687 | Updated: Mar 22, 2023

Settings

Create your own Quiz

Share on Facebook Share on Twitter Share on Whatsapp Share on Pinterest Share on Email Copy to Clipboard Embed on your website

The molar mass is the mass of all the atoms in a molecule in grams per mole. The molar mass M is a physical property defined as the mass of a given substance divided by the amount of substance. Do you understand how the molar mass of a substance is determined? Take this test and find out.

Questions and Answers

1.

What is the molar mass of Carbon?
- A.
  
  6 g/mol
- B.
  
  12.01 g/mol
- C.
  
  19.00 g/mol
- D.
  
  1.01 g/mol
Correct Answer
B. 12.01 g/mol

Explanation
The molar mass of a substance is determined by the average atomic mass according to the periodic table. The molar mass of carbon is 12.01 g/mol

Rate this question:

1
0
2.

What is the molar mass of CH₄ (methane)?
- A.
  
  12.01 g/mol
- B.
  
  13.02 g/mol
- C.
  
  16.05 g/mol
- D.
  
  32.10 g/mol
Correct Answer
C. 16.05 g/mol

Explanation
The molar mass of a substance is determined by the average atomic mass according to the periodic table. There is 1 carbon in CH4 (methane) and 4 hydrogen:
Carbon 1 (12.01) + Hydrogen 4(1.01) = 16.05 g/mol

Rate this question:

1
0
3.

What is the molar mass of (NH₄)₂CO₃ (Ammonium carbonate)?
- A.
  
  96.11 g/mol
- B.
  
  82.10 g/mol
- C.
  
  106.11 g/mol
- D.
  
  43.01 g/mol
Correct Answer
A. 96.11 g/mol

Explanation
Molar mass is the mass of one mole of the substance. The molar mass of a substance is determined by the average atomic mass according to the periodic table. CAUTION: The parentheses indicates that everything within the parentheses is MULTIPLIED by the subscript outside of the parentheses. This means there are 2 nitrogen, 8 hydrogen (4 x 2), 1 carbon and 3 oxygen in this compound.
Nitrogen 2(14.01) + Hydrogen 8 (1.01) + Carbon 1 (12.01) + Oxygen 3(16.00) = 96.11 g/mol

Rate this question:
4.

What is the molecular mass of Cu₃(PO₄)₂?
- A.
  
  253.49 g/mol
- B.
  
  380.59 g/mol
- C.
  
  110.22 g/mol
- D.
  
  348.59 g/mol
Correct Answer
B. 380.59 g/mol

Explanation
Molar mass is the mass of ONE mole of a substance regardless of how many moles there are in the equation. CAUTION: The parentheses indicates that everything within the parentheses is MULTIPLIED by the subscript outside of the parentheses.
This means there are 3 Coppers, 2 Phosphorus, 8 oxygen:
Copper 3 (63.55) + Phosphorus 2(30.97) + 8 (16.00) = 380.59 g/mol

Rate this question:
5.

What is the molecular mass of Aluminum nitrate Al(NO₃)₃from this equation: 2Al(s) + 3Fe(NO₃)₂(aq) à 3Fe(s) + 2Al(NO₃)₃(aq)
- A.
  
  213.01 g/mol
- B.
  
  335.98 g/mol
- C.
  
  56.99 g/mol
- D.
  
  141.01 g/mol
Correct Answer
A. 213.01 g/mol

Explanation
(s) means solid and (aq) means aqueous.
Molar mass is the mass of ONE mole of a substance regardless of how many moles there are in the equation. So, ignore the “2” in front of Al(NO3)3
CAUTION: The parentheses indicates that everything within the parentheses is MULTIPLIED by the subscript outside of the parentheses.
This means there is 1 Aluminum, 3 Nitrogen, 9 oxygen (3 x 3)
The molar mass of a substance is determined by the average atomic mass according to the periodic table.
Aluminum 1 (26.98) + Nitrogen 3 (14.01) + Oxygen 9 (16.00) = 213.01 g/mol

Rate this question:

1
1

Quiz Review Timeline +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

Current Version
Mar 22, 2023

Quiz Edited by
ProProfs Editorial Team
Jul 30, 2010

Quiz Created by
Kwchiro

How Is The Molar Mass Of A Substance Determined?

What is the molar mass of Carbon?

What is the molar mass of CH4 (methane)?

What is the molar mass of (NH4)2CO3 (Ammonium carbonate)?

What is the molecular mass of Cu3(PO4)2?

What is the molecular mass of Aluminum nitrate Al(NO3)3 from this equation: 2Al(s) + 3Fe(NO3)2(aq) à 3Fe(s) + 2Al(NO3)3(aq)

What is the molar mass of CH₄ (methane)?

What is the molar mass of (NH₄)₂CO₃ (Ammonium carbonate)?

What is the molecular mass of Cu₃(PO₄)₂?

What is the molecular mass of Aluminum nitrate Al(NO₃)₃from this equation: 2Al(s) + 3Fe(NO₃)₂(aq) à 3Fe(s) + 2Al(NO₃)₃(aq)