Solutions Part 2

The Total pressure observed by mixing two liquid A and B is 350‌mm‌Hg when their mole fractions are 0.7 and 0.3 respectively.
The Total pressure becomes 410‌mm‌Hg if the mole fractions are changed to 0.2 and 0.8 respectively for A and B. The vapour pressure of pure A is____ mm‌Hg. (Nearest integer)
Consider the liquids and solutions behave ideally.