Alcohols
When 4.6 g of ethanol reacts completely with excess sodium metal, the volume of H2 gas evolved at STP is:
Select the correct option:
Solution
1.12 L
Reaction: 2 C2H5OH + 2 Na -> 2 C2H5ONa + H2. Moles of ethanol = 4.6/46 = 0.1 mol, so moles of H2 formed = 0.1/2 = 0.05 mol. At STP, volume = 0.05 x 22.4 L = 1.12 L. This value is chemically consistent with the stoichiometric 2:1 alcohol-to-hydrogen ratio.
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About This Question
- Subject
- chemistry
- Chapter
- organic compounds containing oxygen
- Topic
- alcohols
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
1.12 L
Reaction: 2 C2H5OH + 2 Na -> 2 C2H5ONa + H2. Moles of ethanol = 4.6/46 = 0.1 mol, so moles of H2 formed = 0.1/2 = 0.05 mol. At STP, volume = 0.05 x 22.4 L = 1.12 L. This value is chemically consistent with the stoichiometric 2:1 alcohol-to-hydrogen ratio.
This medium difficulty chemistry question is from the chapter organic compounds containing oxygen, covering the topic of alcohols. It appeared in the 2025 exam.
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