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A 3 L mixture containing propane (C₃H₈) and butane (C₄H₁₀) is completely burned at 25°C. If the combustion yields 10 L of carbon dioxide, determine the volume ratio of propane to butane in the original mixture.

1. 2:1
2. 1:2
3. 1.5:1.5
4. 0.5:2.5

Correct answer: 2:1

Solution

Let propane=x, butane=y L. x+y=3 and 3x+4y=10 give y=1, x=2, so propane:butane = 2:1. Stored 1:2 is inverted.

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