23. 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 x

10³  Pa and  12 x 10³  Pa, respectively. The containing 40 mole percent of A at this temperature is :

a. x_A   = 0.28; x_B  = 0.72

b. x_A   = 0.76; x_B  = 0.24

c. x_A   = 0.37; x_B  = 0.63

d. x_A   = 0.4; x_B  = 0.6

Ans. a

(9)