Question

A mixture of 0.2mole of alcohol A and 0.5mole of alcohol has a total vapour pressure of 40mmHg at 298k,if the mixture obey's Raoult's law,find the pure pressure of B at 298k given that the pressure of A is 20mmHg at 298k
XA = mols A/total mols = ? = estimated 0.3
XB = mols B/total mols = estimated 0.7

Ptotal = XA*PoA + XB*PoB.
You know Ptotal, XA, XB, and PoA. Solve for PoB.

Post your work if you get stuck.
Pls explain further

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