A) 0.25
B) 0.50
C) 0.75
D) 0.90
Correct Answer: C
Solution :
According to Raoulfs law, \[\frac{{{p}^{o}}-{{p}_{s}}}{{{p}^{o}}}={{\chi }_{B}}\] (where,\[{{\chi }_{B}}=\]mole fraction of solute, B) \[\frac{0.80-0.60}{0.80}={{\chi }_{B}}\] \[\frac{0.20}{0.80}={{\chi }_{B}}\] \[\therefore \] \[{{\chi }_{B}}=0.25\] \[\therefore \]Mole fraction of\[A=1-0.25\] \[=0.75\]You need to login to perform this action.
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