HardNEET TEST
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Vapour pressure of a solution containing 9 g non-volatile solute in 90 g water is 36 Torr. On adding 1 mole water, vapour pressure increases by 3 Torr. Vapour pressure of pure water is:
A
39 Torr
B
66.9 Torr
C
42 Torr
D
45 Torr
Explanation
Moles of water initially = 90/18 = 5; moles of solute = 9/M. Using Raoult’s law and given data, calculation gives vapour pressure of pure water ≈ 66.9 Torr.
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