A-LevelChemistryStates of matterOct/Nov 2025Paper 1 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
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The correct answer is D. This question tests the candidate's understanding of states of matter within the Chemistrysyllabus. The examiner's mark scheme requires...
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