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The minimum number of moles of O2 required for complete combustion of 1 mole of propane and 2 moles of butane is ______.

1. 18
2. 13
3. 5
4. 6.5

Correct answer: 18

Solution

To completely combust propane (C3H8), 5 moles of O2 are needed, and for butane (C4H10), 13 moles of O2 are required. Therefore, the total for 1 mole of propane and 2 moles of butane is 5 + (2 x 13) = 18 moles of O2.

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