Calculating Molar Mass Grade 9a

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| By Mohammad Sayaheen
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Mohammad Sayaheen
Community Contributor
Quizzes Created: 2 | Total Attempts: 1,588
Questions: 5 | Attempts: 258

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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)3 from 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
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