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Question

1 mole of a gaseous aliphatic compound CnH3m is completely burnt in an excess of oxygen. The moles of H2O formed are:

A
m mol
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B
3m2 mol
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C
2 mol
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D
3m mol
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Solution

The correct option is B 3m2 mol
CnH3m+O2CO2+3m2H2O
Since all the H goes in H2O we do not need to balance oxygen and carbon atoms, we can directly calculate.
1 mol of CnH3m produces 3m2 mol of hydrogen gas.

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