The vapour pressure of pure liquid ‘B’ at is — Solutions and Colligative Properties Chemistry Question

💡 Solution & Explanation

Substitute $P_A^\circ = 807.4 \text{ mm Hg}$ into the residue vapour pressure equation: $0.3(807.4) + 0.7 P_B^\circ = 600 \Rightarrow 242.22 + 0.7 P_B^\circ = 600 \Rightarrow 0.7 P_B^\circ = 357.78 \Rightarrow P_B^\circ = 511.1 \text{ mm Hg}$. Therefore, correct answer is B.