Calculating Molar Mass Grade 9a

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| By Mohammad Sayaheen

Mohammad Sayaheen

Community Contributor

Quizzes Created: 2 | Total Attempts: 1,537

Questions: 5 | Attempts: 219 | Updated: Mar 17, 2023

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How is the molar mass of a substance determined?

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

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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

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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

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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

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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

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Current Version
Mar 17, 2023

Quiz Edited by
ProProfs Editorial Team
Feb 10, 2015

Quiz Created by
Mohammad Sayaheen

Calculating Molar Mass Grade 9a

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)