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  • How much amount of NaCl (in grams) should be added to 600g of water to decrease the freezing point of water to ? (Assume that the freezing p

How much amount of NaCl (in grams) should be added to 600g of water to decrease the freezing point of water to -0.2^{\circ}C? (Assume that the freezing point depression constant for water = 2K kg mol-1)
Option: 1 1.76
Option: 2 3.52
Option: 3 4.9
Option: 4 8.58

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best_answer

\begin{array}{l}{\Delta \mathrm{T}_{\mathrm{f}}=0.2^{\circ} \mathrm{C}} \\ {\Delta \mathrm{T}_{\mathrm{f}}=\mathrm{ik_{f}m}} \\ {0.2=2 \times 2 \times \frac{w}{58.5} \times \frac{1000}{600}} \\\\ {w=\frac{0.2 \times 58.5 \times 600}{1000 \times 4}} {=\frac{1.2 \times 58.5}{40}=1.76 \mathrm{g}}\end{array}

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