The molecular weight of a gas that has a density of 5.75 g/L at STP is ________ g/mol.

Name: The molecular weight of a gas that has a density of 5.75 g/L at STP is ________ g/mol.
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Question

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At STP (standard temperature and pressure), 1 mole of any ideal gas occupies 22.4 L. The molecular weight (molar mass) can be calculated using the formula: Molecular weight = Density × Molar volume. Thus, 5.75 g/L × 22.4 L/mol = 128.8 g/mol, which rounds to 129 g/mol.

The Molecular Weight of a Gas That Has a Density