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  4. 100 g of propane is completely reacted with 1000 g of oxygen. The mole fraction of carbon dioxide in the resulting mixture is x × 10-2. The value of x is (Nearest integer) [Atomic weight: H =1.008 ; C =12.00 ; O =16.00 ]

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Q. $100 \,g$ of propane is completely reacted with $1000 \,g$ of oxygen. The mole fraction of carbon dioxide in the resulting mixture is $x \times 10^{-2}$. The value of $x$ is ______(Nearest integer)
[Atomic weight: $H =1.008 ; C =12.00 ; O =16.00$ ]

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Solution:

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mole fraction of $CO _{2}$ in the final reaction mixture (heterogenous)
$ X _{ CO _{2}}=\frac{6.81}{19.9+6.81+9.08} $
$=0.1902=19.02 \times 10^{-2}$
$\Rightarrow 19$