Liquids A and B form an ideal solution in the entire composition range. At 350 K, the vapour pressures of pure A and pure B are 7 × 103 Pa and 12 × 103 Pa, respectively. The composition of the vapour in equilibrium with a solution containing 40 mole percent of A at this temperature is

Liquids A and B form an ideal solution in the entire composition

1.	Liquids A and B form an ideal solution in the entire composition range. At 350 K, the vapour pressures of pure A and pure B are 7 × 103 Pa and 12 × 103 Pa, respectively. The composition of the vapour in equilibrium with a solution containing 40 mole percent of A at this temperature is
A.	xA = 0.76; xB = 0.24
B.	xA = 0.28; xB = 0.72
C.	xA = 0.4; xB = 0.6
D.	xA = 0.37; xB = 0.63
Answer» C. xA = 0.4; xB = 0.6