Question

Given at 350 K pA⁰ = 300 torr and pB⁰ = 800 torr, the composition of the mixture having a normal boiling point of 350 K is :

• A. XA = 0.08
• B. XA = 0.06
• C. XA = 0.04
• D. XA = 0.02

Answer 1

Answer: (A)

XA = 0.08

Answer 2

760 = 300 XA + 800 (1 – XA)

Ž 760 = 800 – 500 XA

Ž 500 XA = 40

\ XA = $\frac{40}{500}$ = 0.08.