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During the electrolysis of water, at the same temperature and pressure, if the volume of hydrogen gas obtained is 20 mL, what will be the volume of oxygen gas?

Answer and explanation

Correct answer: 10 mL

The balanced equation for electrolysis of water is \(2H_2O(l) \rightarrow 2H_2(g) + O_2(g)\). At the same temperature and pressure, gas volumes are proportional to their mole ratio. Therefore, \(H_2:O_2 = 2:1\). Hence, for 20 mL of hydrogen, the oxygen volume is \(20/2 = 10\) mL. Choosing 20 mL would be incorrect because equal volumes of the two gases are not produced.

Related tags

ScienceClass-10Chemical-ReactionsElectrolysisWaterDecomposition-ReactionGas-Volume-Ratio

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