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Class 9 Chemistry · Chapter 4 · Test 6

Molar Mass Calculations

25 MCQs covering molar mass, formula mass, atomic masses, calculating moles from mass, calculating mass from moles, and converting between the mass of a substance and the number of its atoms or molecules.

MCQs

25 questions · 20 min · 25 marks

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Sample questions

The first 5 of 25. Try each one, then tap to see the answer.

  1. Question 1

    What is the molar mass of water H2O?

    • A16 g/mol
    • B17 g/mol
    • C18 g/mol
    • D20 g/mol
    Show answer

    Answer: C

    Water contains two hydrogen atoms and one oxygen atom so its molar mass is 18 g/mol.

  2. Question 2

    What is the molar mass of carbon dioxide CO2?

    • A28 g/mol
    • B32 g/mol
    • C40 g/mol
    • D44 g/mol
    Show answer

    Answer: D

    Carbon dioxide has one carbon atom and two oxygen atoms giving a molar mass of 44 g/mol.

  3. Question 3

    What is the molar mass of oxygen gas O2?

    • A16 g/mol
    • B24 g/mol
    • C32 g/mol
    • D48 g/mol
    Show answer

    Answer: C

    An oxygen molecule contains two oxygen atoms each with a molar mass of 16 g/mol.

  4. Question 4

    What is the molar mass of methane CH4?

    • A12 g/mol
    • B14 g/mol
    • C16 g/mol
    • D18 g/mol
    Show answer

    Answer: C

    Methane contains one carbon atom and four hydrogen atoms giving a molar mass of 16 g/mol.

  5. Question 5

    What is the approximate atomic mass of sodium?

    • A12 u
    • B16 u
    • C23 u
    • D35.5 u
    Show answer

    Answer: C

    Sodium has an approximate atomic mass of 23 u.

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