A-LevelChemistryStates of matterMay/June 2013Paper 1 Q71 Mark
Ethanol has a boiling point of 78°C. At 101 kPa and 79°C ethanol vapour does not perfectly obey the gas equation pV = nRT. What is the reason for this?
AEthanol vapour is in equilibrium with ethanol liquid at 79°C.
BThere are intermolecular forces between the molecules of ethanol vapour.
CThe vapourisation of ethanol liquid is an endothermic process.
DVapours will not obey the gas equation perfectly at such a low pressure.
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The correct answer is B. This question tests the candidate's understanding of states of matter within the Chemistrysyllabus. The examiner's mark scheme requires...
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