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Question

By the reaction of carbon and oxygen, a mixture of CO and CO2 is obtained. The mass ratio of the mixture obtained when 20 g of O2 reacts completely with 12 g of carbon is:

A
mCO:mCO2=21:11
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B
mCO:mCO2=11:21
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C
mCO:mCO2=22:14
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D
mCO:mCO2=14:22
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Solution

The correct option is D mCO:mCO2=21:11
Given:
Moles of C =1212=1

Moles of O2=2032=0.625
Reaction:
Let the moles of oxygen which react with C to form CO2 be x
2C + O2 2CO
1x (1x)/2 1x
C+O2CO2
x x x
We have, (1x)/2+x=0.625
Hence, x=0.25
So, moles of carbon dioxide is equal to 0.25 and moles of carbon monoxide is equal to 0.75 .
So, mass of CO produced is 21 g and mass of CO2 produced is 11 g.

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