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 $7 \times 10^3 \ Pa$ and $12 \times 10^3 \ Pa$,respectively. The composition of the vapour in equilibrium with a solution containing $40 \ \text{mole percent}$ of $A$ at this temperature is
- A$y_A = 0.37$; $y_B = 0.63$
- B$y_A = 0.28$; $y_B = 0.72$
- C$y_A = 0.40$; $y_B = 0.60$
- D$y_A = 0.76$; $y_B = 0.24$
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