A vessel of unknown volume V contains a mixture of propane and methane at a temperature T and exerts a pressure of 320 mm Hg. The gas is burnt in excess `O_2` and all the carbon is recovered as `CO_2`. The `CO_2` is found to have a pressure of 448 mm Hg in a volume V, at the same temperature T. The mole fraction of propane in the original mixture is

Options

A. 0.8
B. 0.2
C. 0.4
D. 0.6

Answer

B