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

question 63

Multiple Choice

A 2.50-L flask contains a mixture of methane (CH₄) and propane (C₃H₈) at a pressure of 1.45 atm and 20°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) 0.34
• B) 1.00
• C) 0.66
• D) 0.85
• E) 0.15

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