Question

If to a solvent (vapour pressure - p not ) , n moles of a non volatile solute are dissolved then the vapour pressure of the solution p is

Answer 1

with the information given in question you can't find vapour pressure of solution, you may say why ? ok let me explain this

you may know that 'relative lowering in vapour pressure is equal to mole fraction of the non volatile solute added in the solution , i'm saying about this formula P(solvent)-P(solution)/P(solvent)=mole fraction of solute(non volatile)

you can't find the exact vapour pressure of the solution without knowing the amount of sovent , yes you can say P(solution) must be less than P(solvent)