Volume of a gas at STP is 1.12 liter. Its mass is 2 g. The density of the gas relative to hydrogen i — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question
Question
Volume of a gas at STP is 1.12 liter. Its mass is 2 g. The density of the gas relative to hydrogen is: [1]
Answer: B
💡 Solution & Explanation
Moles of gas $= 1.12 / 22.4 = 0.05$ mol. <br>Molar mass $= \text{Mass} / \text{Moles} = 2 / 0.05 = 40$ g/mol. <br>Relative density (Vapour Density) $= \text{Molar Mass of Gas} / \text{Molar Mass of } H_2 = 40 / 2 = 20$. [1]
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