JEE Main levelNumerical answerDifficulty 2 of 3so134
At a given temperature the pure liquids A and B have vapour pressures 140 torr and 65 torr. An ideal solution contains 3.0 mol of A and 4.0 mol of B. Calculate the total vapour pressure above the solution (torr, two decimal places).
Numerical answer type, answer in torr, tolerance 0.01.
Answer: 97.14 torr
xA=3/7 and xB=4/7. P=xAPA0+xBPB0=(3/7)(140)+(4/7)(65)=60.00+37.14=97.14 torr.