Answer on Physical Chemistry Question for rahul
Change in T = -Kf x molality of solution
In this solution, molality (b) = (18 /180)/0.2 L + (68.4/342 )/0.200 L = 0.3 mol per 0.2 L = 1.5 moles/1 kg water = 1.8 moles sucrose / kg water.
Change in T = - 1.86 C/m * 1.5 moles/1 kg water = -2.79 C
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