Some liquid is taken in an evacuated vessel and the vessel is sealed. Which of the following graph will correctly represent the achievement of equilibrium of liquid with its vapour at constant temperature? (r_e = rate of evaporation, r_c = rate of condensation)

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TestHub · Accepted Answer

At constant temperature the rate of evaporation r e depends only on the liquid (and its surface), so it stays constant. The rate of condensation r c is proportional to the vapour concentration: it starts at zero (evacuated vessel) and rises as vapour accumulates until r c = r e , which is the equilibrium. Hence the correct graph shows a constant r e line with the r c curve rising to meet it - graph (a). Confirms Ans: (a).

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