What mass of NaCl (molar mass= 58.5g m...

What mass of NaCl `(molar mass= 58.5g mol^-1)` must be dissolved in 65g of water to lower the freezing point by `7.5^@C`? The freezing point depression constant, `K_f for water is 1.86 K kg mol^-1`. Assume vant Hoff factor for NaCl is 1.87.

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