How Is The Molar Mass Of A Substance Determined?

  • IUPAC
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| Attempts: 719 | Questions: 5 | Updated: Mar 22, 2025
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1. What is the molar mass of Carbon?

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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States Of Matter Quizzes & Trivia

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... see moredetermined? Take this test and find out. see less

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2. What is the molar mass of CH4 (methane)?

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)?

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?

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)3 from this equation: 2Al(s)   + 3Fe(NO3)2(aq)   à 3Fe(s)  + 2Al(NO3)3(aq)  

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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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...
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