Multiple choice

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 $O_2$ required is _________. $2CO + O_2 \rightarrow 2CO_2; 2H_2 + O_2 \rightarrow 2H_2O$

  1. 250 litres

  2. 125 litres

  3. 75 litres

  4. 500 litres
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Water gas is 125L H2 and 125L CO. For 2CO + O2 -> 2CO2, 125L CO requires 62.5L O2. For 2H2 + O2 -> 2H2O, 125L H2 requires 62.5L O2. Total O2 = 62.5 + 62.5 = 125L.

AI explanation

Because the mixture is equimolar, 250 litres of water gas contains 125 litres of hydrogen and 125 litres of carbon monoxide. According to the given chemical equations, one volume of carbon monoxide requires half a volume of oxygen, so 125 litres needs 62.5 litres of oxygen; similarly, 125 litres of hydrogen needs 62.5 litres of oxygen. Adding these volumes together, the total oxygen required is 125 litres.

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