Calculating Molar Mass Grade 9a

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| By Mohammad Sayaheen
Mohammad Sayaheen
Community Contributor
Quizzes Created: 2 | Total Attempts: 1,775
| Attempts: 276
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  • 1/5 Questions

    What is the molar mass of Carbon?

    • 6 g/mol
    • 12.01 g/mol
    • 19.00 g/mol
    • 1.01 g/mol
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About This Quiz

This quiz titled 'Calculating Molar Mass grade 9A' assesses knowledge on molar masses of various compounds including Carbon, Methane, Ammonium Carbonate, and more. It enhances understanding of molecular weights essential for chemistry students.

Chemical Compounds Quizzes & Trivia

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  • 2. 

    What is the molar mass of CH4 (methane)?

    • 12.01 g/mol

    • 13.02 g/mol

    • 16.05 g/mol

    • 32.10 g/mol

    Correct Answer
    A. 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 molecular mass of Cu3(PO4)2?

    • 253.49 g/mol

    • 380.59 g/mol

    • 110.22 g/mol

    • 348.59 g/mol

    Correct Answer
    A. 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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  • 4. 

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

    • 96.11 g/mol

    • 82.10 g/mol

    • 106.11 g/mol

    • 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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  • 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)  

    • 213.01 g/mol

    • 335.98 g/mol

    • 56.99 g/mol

    • 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
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