A) 0.70
B) 0.98
C) 1.40
D) 210
Correct Answer: B
Solution :
[b] We know that \[{{P}_{A}}{{V}_{A}}=nRT,{{P}_{B}}{{V}_{B}}={{n}_{B}}RT\]and \[{{\text{P}}_{f}}({{V}_{A}}+{{V}_{B}})=({{n}_{A}}+{{n}_{B}})\,RT\] \[{{\text{P}}_{f}}({{V}_{A}}+{{V}_{B}})={{P}_{A}}{{V}_{A}}+{{P}_{B}}{{V}_{B}}\] \[\therefore {{P}_{f}}=\left( \frac{{{P}_{A}}{{V}_{A}}+{{P}_{B}}{{V}_{B}}}{{{V}_{A}}+{{V}_{B}}} \right)\] \[=\frac{1.4\times 0.1+0.7\times 0.15}{0.1+0.15}MPa\] \[=0.98MPa\]
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