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Carbon Monoxide

A mixture con...

Question

A mixture contains $3$ moles of $C O$ and $C O_{2}$ . On passing the mixture over heated charcoal, volume increases to $5$ moles. Thus, $C O_{2}$ in the mixture is _______ mole(s).

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Solution

Let the the mixture contains x moles of $C O_{2}$ and $3 - x$ moles of CO. When the mixture is heated over charcoal, $C O_{2}$ is converted to CO.
$C O_{2} + C \to 2 C O$
Thus x moles of $C O_{2}$ will form 2x moles of CO.
Total number of moles of CO becomes $3 - x + 2 x = 3 + x = 5$

$x = 2$
Hence, 2 moles of $C O_{2}$ are present.

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