The mole, concentration and empirical formulae

The mole, concentration and empirical formulae Quiz

Spec 1.5–6 · Edexcel International A Level Chemistry: Quiz

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  1. 1. How many atoms are in 0.500 mol of helium (L = 6.02 x 10^23 mol-1)?

    • A. 3.01 x 10^23
    • B. 6.02 x 10^23
    • C. 1.20 x 10^24
    • D. 3.01 x 10^22

  2. 2. What is the concentration of 4.00 g of NaOH (M = 40.0 g mol-1) in 500 cm3 of solution?

    • A. 0.0500 mol dm-3
    • B. 0.100 mol dm-3
    • C. 0.200 mol dm-3
    • D. 0.800 mol dm-3

  3. 3. A compound contains 40.0% C, 6.7% H and 53.3% O by mass. What is its empirical formula (C 12.0, H 1.0, O 16.0)?

    • A. CHO
    • B. CH2O
    • C. C2H4O
    • D. CH4O

  4. 4. Burning 0.100 mol of a hydrocarbon gives 0.300 mol H2O. How many moles of hydrogen atoms were in the hydrocarbon?

    • A. 0.300 mol
    • B. 0.150 mol
    • C. 0.600 mol
    • D. 0.900 mol

  5. 5. A compound has empirical formula C2H5 and Mr = 58.0 (C 12.0, H 1.0). What is its molecular formula?

    • A. C2H5
    • B. C4H10
    • C. C3H7
    • D. C5H12

Quiz