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  4. How much volume of oxygen at STP, in litre is required to burn 4 g of methane gas completely?

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Q. How much volume of oxygen at $STP$, in litre is required to burn $4\,g$ of methane gas completely?

J & K CETJ & K CET 2009Some Basic Concepts of Chemistry

Solution:

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At STP, $ \because $ For the combustion of $ 16\,g\,CH_{4}, $
oxygen Required $ =2\times 22.4\,L $
$ \therefore $ For the combustion of $ 4\,g\,CH_{4}, $
oxygen required will be
$ =\frac{2\times 22.4\times 4}{16}L $
$ =11.2\,L $