1 kg on 0.75 molal aqueous solution of sucrose can be cooled up to -4°C before freezing. The amount of ice (in g) that will be separated out is__________. (Nearest integer)
[Given : Kf(H2O) = 1.86K kg mol-1]
1 kg on 0.75 molal aqueous solution of sucrose can be cooled up to -4°C before freezing. The amount of ice (in g) that will be separated out is__________. (Nearest integer)
[Given : Kf(H2O) = 1.86K kg mol-1]
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1 Answer
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Let mass of water initially = x gram
Mass of sucrose = (1000 – x) gram
Mole of sucrose =
0.75 molal Þ 0.75 mole solute in 1 kg of solvent
a = 0.2775kg or 277.5 gram
Ice separated = (795.86 – 277.5) gram
= 518.3 gram
Ans. = 518 (the nearest integer)
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