How many moles of $H_{2} O$ is produced when $C_{3} H_{8}$ undergoes combustion ?
4

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Solution

The correct option is A 4
Alkanes on heating in sufficient supply of oxygen undergoes combustion producing carbon dioxide and water. Propane $(C_{3} H_{8})$ combines with oxygen to form carbon dioxide and water. The reaction takes place as follows:
$C_{3} H_{8} (g) + 5 O_{2} (g) \to 3 {CO}_{2} (g) + 4 H_{2} O (l)$

Thus, 3 moles of carbon dioxide and 4 moles of water is produced on combustion of propane.

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