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Percentage Composition

In a reaction...

Question

In a reaction, if $7$ g of $C O$ is completely oxidised to $C O_{2}$ , the weight of $C O_{2}$ formed in $g m$ is:

A

14

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B

11

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C

44

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D

30

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Solution

The correct option is B $11$
$C O + \frac{1}{2} O_{2} \to C O_{2}$

The molecular weights of $C O$ and $C O_{2}$ are $28$ g/mol and $44$ g/mol respectively.

7 g of $C O$ corresponds to $0.25$ moles. They react with oxygen to produce $0.25$ moles of $C O_{2}$ .

$0.25$ moles of $C O_{2}$ corresponds to $11$ g.

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