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Question

Calculate the mass in grams of 0.17 mole of hydrogen sulphide, H2S.
(Atomic masses : H = 1 u, S = 32 u)

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Solution

Moles of hydrogen sulphide = 0.17
Molar mass of hydrogen sulphide = (2 × 1) + (1 × 32)g = 34g
1 mole of hydrogen sulphide weighs = 34g
Therefore, mass of 0.17 moles of hydrogen sulphide = 34 × 0.17 = 5.78g
Hence, 0.17 moles of hydrogen sulphide weigh 5.78 grams.

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