WAEC Chemistry 2011 Objective — Question 17
Question 17 of 50 from the West African Examinations Council (WAEC) Chemistry 2011 Objective paper, with the correct answer and a full explanation.
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The volume occupied by 17g of H2S at s.t.p. is [H=1.00, S=32.0, Molar volume = 22.4 dm³]
- A. A. 11.2dm³Correct
- B. B. 17.0dm³
- C. C. 34.0dm³
- D. D. 44.8dm³
Explanation
Molar mass of H2S = (1x2)+32 = 34 gmol⁻¹. Mole of H2S = 17g/34gmol⁻¹ = 0.5 mol. Volume = mole x GMV = 0.5 x 22.4 = 11.2 dm³.
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