A simple of thliqid `H_(2)O` at 18.0 g is inlected into an evacuated 7.6 L flask maintained at `27.0^(@)C`. If vapour pressure of `H_(0)O` at `27.0^(@)C` is 24.63 mm Hg, what wight percentage of the water will be vaproueied when the ssystem 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. 0.01
B. 0.1
C. 0.18
D. 0.2

Answer

A

Explanation

Initial mass of `H_2O(l) = 18g`:
`n_(H_2O)(g) = ((24.63/760)xx7.6)/(0.0821xx300) rArr 0.01`
% wt.of H_2O vaporised `= (0.01xx18)/18 xx100 rArr 1%`