A-LevelChemistryStates of matter9701/12 · Oct/Nov 2025 · Q81 Mark
A pure sample of a gas has a density of 2.62g dm⁻³ at 101000 Pa and 25°C. The gas behaves ideally under these conditions. Which expression gives the Mr of the gas?
A101000 × 0.001 / 2.62 x 8.31×25
B101000 × 0.001 / 2.62 x 8.31×298
C2.62 x 8.31×25 / 101000 × 0.001
D2.62 x 8.31×298 / 101000 × 0.001
✓ Correct answer
D: 2.62 x 8.31×298 / 101000 × 0.001
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