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  4. When a hydrocarbon A undergoes complete combustion it requires 11 equivalents of oxygen and produces 4 equivalents of water. What is the molecular formula of A ?

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Q. When a hydrocarbon A undergoes complete combustion it requires $11 $ equivalents of oxygen and produces $4$ equivalents of water. What is the molecular formula of $A$ ?

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Solution:

$ C _{ x } H _{ y }+\left( x +\frac{ y }{4}\right) O _2 \rightarrow xCO _2+\frac{ y }{2} H _2 O $
$ \frac{ y }{2}=4 \therefore y =8 $
$ x +\frac{8}{4}=11 $
$ \therefore x =9 $
$ \therefore $ Hydrocarbon will be$= C _9 H _8$