Answer to Question #350862 in Physical Chemistry for cookie

Question

7.Determine the composition of a methanol-ethanol mixture over which the equilibrium vapour pressure is 5.0 kPa. Assume that the mixture is ideal.

(Vapour pressure of pure methanol is 8.9 kPa; vapour pressure of pure ethanol is 4.0 kPa)

Report your answer in terms of mole fraction of methanol as a decimal to 3 significant figures. Do NOT include any words, symbols, units or spaces in your answer.

8.Use the information provided in question 7 to answer the question below.

Which statement is true about the composition of the vapour above an equimolar mixture of methanol and ethanol?

a.the vapour component that is in larger proportion depends on temperature

b.the vapour contains more ethanol than methanol

c.the vapour contains more methanol than ethanol

d.the vapour has equal amounts of methanol and ethanol

Answer 1

The answer to your question is provided in the image: