of a gas occupies at STP. What is the molecular weight of the gas? — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question
Question
$5\text{ g}$ of a gas occupies $2.8\text{ L}$ at STP. What is the molecular weight of the gas?
Answer: 40
💡 Solution & Explanation
$\text{moles} = 2.8 / 22.4 = 0.125\text{ mol}$. <br>$\text{MW} = \text{mass} / \text{moles} = 5 / 0.125 = 40\text{ g/mol}$.
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