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Question

Water gas is an equi-molar mixture of hydrogen and carbon monoxide. If 250 litres of water gas is burnt in air. Assuming both reactants and products are at same temperature and pressure, the volume of O2 required is _________.
2CO+O22CO2;2H2+O22H2O

A
250 litres
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B
125 litres
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C
75 litres
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D
500 litres
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Solution

The correct option is B 125 litres
Equation for combustion of water gas in air is:

2CO+O22CO2 & 2H2+O22H2O

For combustion of 1 mole of water gas (CO+H2) , 1/2 mole of O2 is required.

Therefore, for combustion of 250L of water gas, amount of oxygen required =2502=125L of O2 is required.

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