The vapour pressure of a solution (P) and the vapour pressure of the solvent `(P^(@))` are related to each others as `(x_(1)` is the mole fraction of solvent)

Options

A. `P = P^(@) x_(2)`
B. `P = P^(@) x_(1)`
C. `P^(@) = P x_(1)`
D. `P^(@) = P x_(2)`

Answer

B

Explanation

Vapour pressure of solution (P) = Vapour pressure of the solvent in solution = Mole fraction of the solvent `xx V.P` of pure solvent
`= x_(1) xx P^(@) = P^(@) x_(1)`.