A) 205 mm
B) 2.05 mm
C) 1.05 mm
D) 105 mm
Correct Answer: D
Solution :
| [d] According to Raoult's law for liquid mixtures. |
| \[P={{P}_{A}}+{{P}_{B}}\] |
| \[P=P_{A}^{0}\times \frac{\frac{{{W}_{A}}}{{{M}_{A}}}}{\frac{{{W}_{A}}}{{{M}_{A}}}+\frac{{{W}_{B}}}{{{M}_{B}}}}+P_{B}^{0}\times \frac{\frac{{{W}_{B}}}{{{M}_{B}}}}{\frac{{{W}_{A}}}{{{M}_{A}}}+\frac{{{W}_{B}}}{{{M}_{B}}}}\] |
| \[P=145=P_{A}^{0}\times \frac{\frac{64}{128}}{\frac{64}{128}+\frac{36}{18}}+155\times \frac{\frac{36}{18}}{\frac{64}{128}+\frac{36}{18}}\] |
| \[P_{A}^{0}=105\,mm\] |
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