A) 49.50
B) 59.60
C) 69.40
D) 79.82
Correct Answer: C
Solution :
According to Raoult?s law: \[\frac{{{p}_{0}}-{{p}_{s}}}{{{p}_{0}}}=\frac{w\times M}{m\times W}\] \[\frac{640-600}{640}=\frac{2.175\times 78}{m\times 39.08}\] \[(M\,for\,{{C}_{6}}{{H}_{6}}=78)\] \[m=\frac{2.175\times 78\times 640}{40\times 39.08}\] \[=69.45\,\approx \,\,=69.4\]You need to login to perform this action.
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