Relative formula mass and the mole

Relative formula mass and the mole Quiz

IB MYP Chemistry: Quiz

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5 questions, one answer each

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  1. 1. What is the Mr of magnesium hydroxide, Mg(OH)₂? (Mg = 24, O = 16, H = 1)

    • A. 41
    • B. 58
    • C. 42
    • D. 82

  2. 2. How many moles are in 22 g of carbon dioxide, CO₂? (C = 12, O = 16)

    • A. 0.5
    • B. 2
    • C. 44
    • D. 0.05

  3. 3. What is the mass of 0.20 mol of sodium chloride, NaCl? (Na = 23, Cl = 35.5)

    • A. 0.0034 g
    • B. 292.5 g
    • C. 58.5 g
    • D. 11.7 g

  4. 4. What is the number of molecules in 0.50 mol of a substance?

    • A. 6.02 × 10²³
    • B. 1.2 × 10²⁴
    • C. 3.01 × 10²³
    • D. 6.02 × 10²²

  5. 5. One mole of oxygen molecules, O₂, has a mass of 32 g. How many oxygen atoms does it contain?

    • A. 6.02 × 10²³
    • B. 3.01 × 10²³
    • C. 1.20 × 10²⁴
    • D. 32

Quiz