A solution of sucrose (Molar mass = 342) has been prepared by dissolving 68.4g of sucrose in one kg of water. K f for water is 1 .86 K kg mol - 1 . The freezing point of the solution will be

Question

A solution of sucrose (Molar mass = 342) has been prepared by dissolving 68.4g of sucrose in one kg of water. K f for water is 1 .86 K kg mol - 1 . The freezing point of the solution will be, - 0 .684 0 C, - 0 .342 0 C, - 0 .372 0 C, - 0 .186 0 C

MARKS App · Accepted Answer

ΔT f = K f . m ΔT f = i × k f × m T f 0 - T f S = i × k f × m 0 - T f s = 1 1 .86 kkg mo l - 1 68 .4 342 1 mol / kg = 0 .372 0 k = 0 .372 0 C T f S = - 0 .372 0 C

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