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  4. When a hydrocarbon A undergoes combustion in the presence of air, it requires 9.5 equivalents of oxygen and produces 3 equivalents of water. What is the molecular formula of A ?

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Q. When a hydrocarbon A undergoes combustion in the presence of air, it requires $9.5$ equivalents of oxygen and produces $3$ equivalents of water. What is the molecular formula of $A$ ?

JEE MainJEE Main 2023Some Basic Concepts of Chemistry

Solution:

$C _{ x } H _{ y }+\left( x +\frac{ y }{4}\right) O _2 \rightarrow xCO _2+\frac{ y }{2} H _2 O$
$ x +\frac{ y }{4}=9.5 $
$ \frac{ y }{2}=3 $
$ \Rightarrow x =8, y =6$