A sample of liquid `H_2O` of mass 18.0 g is injected into an evacuated 7.6 L flask maintained at `27^@C.` If vapour pressure of `H_(2)O` at `27^@C` is 24.63 mm Hg, what weight percentage of the water will be vapourised when the system comes to equilibrium? Assume water vapours behaves as an ideal gas. The volume occupied by the liquid water is negligible compared to the volume of the container:

Options

A. `1%`
B. `10%`
C. `18%`
D. `20%`

Answer

A

Explanation

Intial wt of `H_(2)O (l)= 18g`,
`n_(H_(2)O) (g) = (((24.63)/(760))xx 7.6)/(0.0821 xx 300)rArr 0.01`
% wt of `H_(2)O` vaporised `= (0.01 xx 18)/(18) xx 100 rArr 1%`