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Q.

The minimum number of moles of $O_{2}$ required for complete combustion of 1 mole of propane and 2 moles of butane is ____.

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answer is 18.

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Detailed Solution

$C_{3} H_{8} + {5 O}_{2} \to 3 {CO}_{2} + 4 H_{2} O 1 mol 5 mol$

$C_{4} H_{10} + \frac{13}{2} O_{2} \to 4 C O_{2} + 5 H_{2} O$

For 2 moles of butane 13 mole of $O_{2}$

Hence the correct answer is 18.

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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 ____.