Question

Which of the following behaviour is true for an ideal binary solution?

• A. Plot of $P_{total}$ versus $y_B$ (mole fraction of B in vapour phase) is linear
• B. Plot of $P_{total}$ versus $y_A$ is linear
• C. Plot of $\frac{1}{P_{total}}$ versus $y_A$ (or $y_B$) is non-linear
• D. Plot of $\frac{1}{P_{total}}$ versus $y_A$ (or $y_B$) is linear

Answer 1

The correct option is D Plot of $\frac{1}{P_{total}}$ versus $y_A$ (or $y_B$) is linear

For vapour phase we have,

$P_A=P_{total}\times y_A$

So, $\frac{1}{P_{total}}=\frac{y_A}{P_A}$

So, plot of $\frac{1}{P_{total}}$ versus $y_A$ is linear