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What mass of NaCI must be dissolved in 65.0 g of water to lower the freezing point of water by $7.50^{\large\circ}$C? The freezing point depression constant ($K_f$) for water is 1.86$^{\large\circ}$C/m. Assume van't Hoff factor for NaCI is 1.87. (Molar mass of NaCI = 58.5 g $mol^{−1}$)

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Hence (A) is the correct answer.
answered Jun 13, 2014 by sreemathi.v

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