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Ideal Gas Equation

When one mole...

Question

When one mole each of CO and $O_{2}$ are made to react at STP, the total number of moles at an end of the reaction is:

A

1.5 moles

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B

1 mole

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C

4 moles

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D

2 moles

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Solution

The correct option is A 1.5 moles
$2 C O + O_{2} \to 2 C O_{2}$

Initially, we have one mole of each CO and $O_{2}$ .

1 mole of CO will react with 0.5 mole of $O_{2}$ to form 1 mole of $C O_{2}$ .

The total no. of moles at the end of the reaction is 0.5 mole $O_{2}$ + 1 mole of CO $_{2} = 1.5$ moles

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