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Answer: Vapour pressure is related with the molecular weight, lower the molecular weight higher the vapour pressure. since CH 3 OH has less molecular weight as compare to C 2 H 5 OH thus CH 3 OH has higher vapour pressure than C 2 H 5 OH at the same temperature.

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Which of the following has higher vapour pressure at same temperature: CH₃OH (b. p. 640.5⁰C) and C₂H₅OH (b.p. 78.3⁰C)?

Answer

Answer:

Vapour pressure is related with the molecular weight, lower the molecular weight higher the vapour pressure. since CH₃OH has less molecular weight as compare to C₂H₅OH thus CH₃OH has higher vapour pressure than C₂H₅OH at the same temperature.