I need help with all parts please! if you could explain how to solve that would help a lot, thanks!

2. At 69 C, the saturation pressures of benzene(1) and 2-propanol(2) are 530 mmHg and 434 mmHg, respectively. When mixed together, they form a nonideal solution that could be reasonablly be decsribed by In 72 = Ax] : In 72 = Ax? Ax} ; In y2 = Ax] where A is a constant. a (a) The binary system form an azeotrope at this temperature whose composition is x1 =0.61. Us this information to estimate the value of A. (b) If a liquid solution containing 25 mol% benzene and the rest 2-propanol is to be flashed at 69 C to obatin a new solution at x = 0.2, use your model from (a) to determine the pressure and the "quality" Y of the flash operation. (C) If you accidentally assume ideal soluiton for the flash operation in (b), calculate the resultant % error in the determination of pressure