MHT CET Chemistry question
The mole fraction of ethyl alcohol in its solutions with methyl alcohol is 0.80. The vapour pressure of pure ethyl alcohol is 40 mm of Hg. What is its vapour pressure in solution if the solution is ideal?
Answer: (C)
Solution
By Raoult's law, partial pressure = mm Hg; 25, 30 and 20 mm do not follow. Hence the correct option is (c).