When a certain amount of solid A is dissolved in 100 g of water at 25 ° C to make a dilute solution, the vapour pressure of the solution is reduced to one-half of that of pure water. The vapour pressu

Question

When a certain amount of solid A is dissolved in 100 g of water at 25 ° C to make a dilute solution, the vapour pressure of the solution is reduced to one-half of that of pure water. The vapour pressure of pure water is 23 . 76 mmHg . The number of moles of solute A added is

TestHub · Accepted Answer

We know that relative lowering in vapour pressure is given as P 0 - P S P o = solute n n Solute + solvent n P 0 - P S P S = solute n solvent n P 0 - P 0 2 P 0 2 = solute n solvent n solute n = solvent n = 100 18 = 5 . 55 mol

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