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Q.

A sample of liquid H2O of mass 18.0 g is injected into an evacuated 7.6 L flask maintained at 27.0oC. lf vapoure pressure of H2O at 27oC 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:

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a

1 %

b

10 %

c

18 %

d

20 %

answer is A.

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Detailed Solution

Initial wt. of H2O(l)=18gnH2O(g)=24.63760×7.60.0821×300⇒0.01 % wt. of H2O vaporised =0.01×1818×100⇒ 1%

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A sample of liquid H2O of mass 18.0 g is injected into an evacuated 7.6 L flask maintained at 27.0oC. lf vapoure pressure of H2O at 27oC 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: