An ideal solution contains two volatile liquids A (p o = 100 torr) and B (p o = 200 torr). If mixture contains 1 mole of A and 4 moles of B, then total vapour pressure of the distillate is

Question

An ideal solution contains two volatile liquids A (p o = 100 torr) and B (p o = 200 torr). If mixture contains 1 mole of A and 4 moles of B, then total vapour pressure of the distillate is, 150 torr, 180 torr, 188.88 torr, 198.88 torr

MARKS App · Accepted Answer

p Total = p A ∘ X A + p B ∘ X B = 1 0 0 × 1 5 + 2 0 0 × 4 5 = 2 0 + 1 6 0 = 1 8 0 (Vapours are condensed and again brought in equilibrium with vapours). i.e for distillate y A → to be replaced by x A y B → to be replaced by x B . y A = p A o x A p T = 2 0 1 8 0 y B = p B o x B p T = 1 6 0 1 8 0 P distillate = 1 0 0 × 2 0 1 8 0 + 2 0 0 × 1 6 0 1 8 0 = 188.88

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