A) 23.88
B) 31.12
C) 25.47
D) 29.92
Correct Answer: D
Solution :
[d] Using Raoult's Law: \[\frac{{{P}^{0}}-{{P}_{S}}}{{{P}_{S}}}=\frac{{{W}_{2}}M{{w}_{1}}}{M{{w}_{2}}.{{W}_{1}}}\] If \[{{P}^{0}}=100mm\] then \[{{P}_{S}}=100-35=65\,mm\] \[\frac{100-65}{65}=\frac{{{W}_{2}}\times 18}{60\times 18}\] \[\Rightarrow {{W}_{2}}=\frac{35\times 60\times 150}{65\times 18}=269.23\] \[\therefore \]Molality \[=\frac{{{W}_{2}}\times 1000}{M{{w}_{2}}\times {{W}_{1}}}=\frac{269.23\times 1000}{60\times 150}\] \[=29.92m\]
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