alleryStart learning →Water is electrolyzed and both gases are collected. How do the two volumes compare?
AOxygen fills twice the volume of hydrogen
BHydrogen fills twice the volume of oxygen
CBoth gases fill the same volume exactly
DHydrogen fills four times the oxygen volume
Answer & Solution
Correct answer: B. Hydrogen fills twice the volume of oxygen
1. Splitting water gives two molecules of hydrogen for every one molecule of oxygen.
2. Equal numbers of gas molecules occupy equal volumes under the same conditions.
3. Twice as many hydrogen molecules therefore fill twice the volume.
4. The acid added to the water only raises the ion concentration and is not consumed.
5. Reversing the ratio would mean water contained twice as much oxygen as hydrogen.
_Source: OpenStax Chemistry (CC BY 4.0), Chs 7 and 17, section 17.7 Electrolysis_
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