If the vapours are compressed slowly and isothermally, at what pressure, the first drop of liquid wi — Solutions and Colligative Properties Chemistry Question

💡 Solution & Explanation

As calculated in the previous step, the dew point pressure is given by $P_{\text{dew}} = \frac{1}{(Y_A / P_A^\circ) + (Y_B / P_B^\circ)} = \frac{1}{1 + 1} = 0.5 \text{ bar}$. Thus, the first drop of liquid appears at 0.5 bar. Therefore, correct answer is B.