A) \[-{{6.45}^{o}}C\]
B) \[-{{5.1}^{o}}C\]
C) \[{{1.02}^{o}}C\]
D) \[-{{3.5}^{o}}C\]
Correct Answer: A
Solution :
\[10%\]solution means,\[1.00kg\]solution contains\[0.100\,\,kg\,\,C{{H}_{3}}OH\]and\[0.900\,\,kg\,\,{{H}_{2}}O\]. Molality,\[m=\frac{0.100\times 1000}{32\times 0.900}\] \[\Delta {{T}_{f}}=km=({{1.86}^{o}}C/m)(3.47\,\,m)={{6.45}^{o}}C\] Freezing point\[=-{{6.45}^{o}}C\]
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