試題詳解

1. A mixture of C₂H₆(g) and C₃H₈(g) in a closed rigid container has a total pressure of 1.0 atm. Just enough O₂(g) is added to the mixture to bring about its complete combustion to CO₂(g) and H₂O(g). After the combustion, the total pressure in the container is 6.3 atm. Assuming constant temperature and volume, find the mole fraction of C₃H₈(g) in the original mixture.
(A) 0.25
(B) 0.35
(C) 0.50
(E) 0.75
(D) 0.65