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During electrolysis of water, at the same temperature and pressure, if the volume of oxygen collected is 7 mL, what volume of hydrogen will be collected?

Answer and explanation

Correct answer: 14 mL

The balanced equation for electrolysis of water is \(2H_2O \rightarrow 2H_2 + O_2\). At the same temperature and pressure, gas volumes are proportional to their mole ratios. Therefore, the volume ratio of hydrogen to oxygen is \(2:1\). For 7 mL of oxygen, the volume of hydrogen is \(2 \times 7 = 14\) mL. The value 21 mL would result from incorrectly using a \(3:1\) ratio.

Related tags

ScienceClass 10Chemical ReactionsElectrolysis Of WaterGas Volume Ratio

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