The number of oxygen molecules used in the combustion of $1$ molecule of ethanol is?

1

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2

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3

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4

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Solution

The correct option is B $3$
Balanced equation for combustion of ethanol can be written as:
$C_{2} H_{5} O H + 3 O_{2} \to 2 C O_{2} + 3 H_{2} O$
Therefore, for combustion of $1$ molecule of ethanol, $3$ molecules of oxygen are required.
Option $C$ is correct.

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