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