water has a vapour pressure of 23.76 torr at 25C.what is the vapour pressure of a solution of sucrose ,if its mole fraction is 0.25?

Answer 1

I assume you mean Xsucrose = 0.25 which makes XH2O = 0.75.
Then Psoln = XH2O*P^o_normal
Psoln (in torr) = 0.75*23.76