The total pressure observed by mixing two liquids A and B is \( 350 \, \text{mm Hg} \) when their mole fractions are \( 0.7 \) and \( 0.3 \) respectively.
The total pressure becomes \( 410 \, \text{mm Hg} \) if the mole fractions are changed to \( 0.2 \) and \( 0.8 \) respectively for A and B. The vapour pressure of pure A is __________ mm Hg. (Nearest integer)
Consider the liquids and solutions behave ideally.
