A) \[-{{0.570}^{o}}C\]
B) \[-{{0.372}^{o}}C\]
C) \[-{{0.520}^{o}}C\]
D) \[+{{0.372}^{o}}C\]
Correct Answer: B
Solution :
\[\Delta {{T}_{f}}=\frac{1000\times {{K}_{f}}\times {{w}_{2}}}{{{M}_{2}}\times {{w}_{1}}}\] \[=\frac{1000\times 1.86\times 68.5}{342\times 1000}={{0.372}^{o}}C\] \[\Delta {{T}_{f}}=T_{f}^{o}-\Delta {{T}_{f}}=0-0.372={{0.372}^{o}}C\]
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