A) 290 K
B) 285.5 K
C) 267.42 K
D) 250 K
Correct Answer: C
Solution :
| \[\Delta \,{{T}_{f}}=i.m.\,\,{{K}_{f}}\] |
| \[\Delta \,{{T}_{f}}={{i}_{1}}{{m}_{1}}{{K}_{f}}+{{i}_{2}}{{m}_{2}}{{K}_{f}}+{{i}_{3}}{{m}_{3}}{{K}_{f}}=({{m}_{1}}+2{{m}_{2}}+{{m}_{3}}){{K}_{f}}\] |
| \[\Delta \,{{T}_{f}}=\frac{\frac{3}{60}+\frac{7.45\times 2}{74.5}+\frac{9}{180}}{100}\times 1000\times 1.86\] |
| \[\Delta \,{{T}_{f}}=3\times 1.86\]\[=5.58\] |
| \[{{T}_{f}}\]of solution \[=273-5.58=267.42\,\,K\] |
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