The vapour pressure of pure A is 10 torr and at the same temperature when 1g of B is dissolved in 20 g of A, its vapour pressure is reduced to 9.0 torr. If the molecular mass of A is 200 amu, then the molecular mass of B is
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a
100 amu
b
65 amu
c
75 amu
d
120 amu
answer is A.
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Detailed Solution
MW of A (solvent) = 200 (Mo)For very dilute solutions, according to Raoult's lawMw of solute(Ms) = 100amu
The vapour pressure of pure A is 10 torr and at the same temperature when 1g of B is dissolved in 20 g of A, its vapour pressure is reduced to 9.0 torr. If the molecular mass of A is 200 amu, then the molecular mass of B is