MDCAT Chemistry MCQ #41

A laboratory technician reacts 2.3g of metallic sodium with an excess of absolute ethanol. What volume of hydrogen gas is evolved at STP?

MDCAT Chemistry MCQ #41

  1. Question 1

    Q1. A laboratory technician reacts 2.3g of metallic sodium with an excess of absolute ethanol. What volume of hydrogen gas is evolved at STP?

    • A) 0.56 dm3
    • B) 1.12 dm3
    • C) 2.24 dm3
    • D) 22.4 dm3

    Answer: 1.12 dm3

    Explanation: 2.3g Na is 0.1 moles; since 2 moles Na produce 1 mole H2, 0.05 moles H2 occupies 1.12 dm3. 2.24 dm3 assumes 1:1 ratio.