A 250-L Flask Contains a Mixture of Methane (CH₄) and Propane

A 2.50-L flask contains a mixture of methane (CH₄) and propane (C₃H₈) at a pressure of 1.45 atm and 20 ^$\circ$ C. When this gas mixture is then burned in excess oxygen, 8.60 g of carbon dioxide is formed. (The other product is water.) What is the mole fraction of methane in the original gas mixture

A) 0.145
B) 0.341
C) 0.659
D) 0.855
E) 1.00

Correct Answer:

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