Question

Mixture of volatile components A and B has total vapour pressure (in torr):
p = 254 – 135 $x_A,$ where $x_A$ is the mole fraction of A in mixture hence $p_A^o$ and $p_B^o$ are (in torr)

• A. 254, 119
• B. 119, 254
• C. 135, 254
• D. 154, 119

Answer 1

The correct option is B 119, 254

p = 254 – 135 $x_A$
when A is pure $x_A$ = 1, So p = $254–135$=119 torr
when B is pure $x_A$ = 0, So p = $254–0$=254 torr