If an alkane has number of carbon atoms equal to n, then the number of moles of oxygen required for its complete combustion is?
3n+12
n2
(2n+1)
2n
A
3n+12
B
(2n+1)
C
2n
D
n2
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Solution
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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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