The minimum number of moles of `O_(2)` required for complete combustion of 1 mole of propane and 2 moles of butane is _______.

Answer

18

Explanation

`underset("1 mole")(C_(3)H_(8)) + underset("5 mole")(SO_(2)) to 3CO_(2) + 4H_(2)O`
For 1 mole propane combustion 5 mole `O_2` required.
`C_(4)H_(10) + 13/2 O_(2) to 4CO_(2) + 5H_(2)O`
For 2 moles of butane 13 mole of `O_2` is required total moles = `13 + 5 = 18`.