A) 140 torr
B) 20 torr
C) 68 torr
D) 72 torr
Correct Answer: D
Solution :
\[{{P}_{T}}=P_{P}^{0}{{X}_{P}}+P_{Q}^{0}{{X}_{Q}}\];\[{{P}_{T}}=80\times \frac{3}{5}+60\times \frac{2}{5}\] \[{{P}_{T}}=48+24=72\ torr\].
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