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Question

If an alkane has number of carbon atoms equal to n, then the number of moles of oxygen required for its complete combustion is?

A
3n+12
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B
2n
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C
n2
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D
(2n+1)
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Solution

The correct option is A 3n+12
CH4 +2O2 CO2 +2H2O
C2H6+ 72O2 2CO2 +3H2O
On observing these two reactions we can make general formula for requirement of oxygen molecules.
In general for an alkalane having 'n' number of carbon atoms
no. of moles of oxygen required will be= 3n+12

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