Molar mass of compound, The freezing point of a solution having 4.8 g of a compound in 60

Molar mass of compound

The freezing point of a solution having 4.8 g of a compound in 60 g of benzene is 4.48. Determine the molar mass of the compound (K_f = 5.1 Km^-1) , (freezing point of benzene = 5.5^oC)
(a) 100 (b) 200 (c) 300 (d) 400

Answer: (d) m = (K_f x 1000 x w)/W x ΔT_f = (5.1 x 1000 x 4.80)/(60 x 1.02) = 400

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