Question

Which of the following plots represents an ideal binary mixture?

• A. Plot of $P_{total}v/s1/X$ is linear ( $X_B$= mole fraction of 'B' in liquid phase).
• B. Plot of $P_{total}v/s{Y}_A$ is linear $(Y_B=$ mole fraction of 'A' in vapour phase)
• C. Plot of $\frac{1}{P_{total}}v/s{Y}_A$ is linear
• D. Plot of $\frac{1}{P_{total}}v/s{Y}_B$ is non linear

Answer 1

The correct option is C Plot of $\frac{1}{P_{total}}v/s{Y}_A$ is linear

The relationship between the total pressure and the mole fraction of A in the vapour phase is $\frac{1}{P_{total}}=\frac{y_A}{P_A^o}+\frac{y_B}{P_B^o}$
Hence, the plot of $\frac{1}{P_{total}}vs{Y}_A$ is linear.