100 cc of carbon monoxide was mixed with excess of oxygen and exploded. Find the volume of oxygen used and the volume of carbon dioxide formed:

50 c c, 100 c c

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100 c c, 150 c c

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150 c c, 200 c c

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200 c c, 250 c c

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Solution

The correct option is A $50 c c, 100 c c$
The balanced chemical equation for the combustion of CO is
$2 C O + O_{2} \to 2 C O_{2}$
2 moles of $C O$ react with 1 mole of $O_{2}$ to form 2 moles of $C O_{2}$ .
Volume of a gas is directly proportional to the number of moles.
Hence, 2 cc of $C O$ react with 1 cc of $O_{2}$ to form 2 cc of $C O_{2}$ .
100 cc of $C O$ react with $100 \times \frac{1}{2} = 50$ cc of $O_{2}$ to form 100 cc of $C O_{2}$ .
Thus, the option (A) is the correct answer.

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