Molecular Formula
Mediumchemistry
A compound contains C=40%, H=6.7%, O=53.3%. The empirical formula is:
Select the correct option:
Solution
Incorrect! Answer:
CH₂O
To find the Empirical Formula:
- Moles Calculation:
- C:40/12.0≈3.33 mol
- H:6.7/1.0=6.7 mol
- O:53.3/16.0≈3.33 mol
- Divide by Smallest:
- C:3.33/3.33=1
- H:6.7/3.33≈2
- O:3.33/3.33=1
- Relative Ratio: 1:2:1.
- Empirical Formula: CH2O.
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About This Question
- Subject
- chemistry
- Chapter
- purification and characterisation of organic compounds
- Topic
- molecular formula
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
CH₂O
To find the Empirical Formula:
- Moles Calculation:
- C:40/12.0≈3.33 mol
- H:6.7/1.0=6.7 mol
- O:53.3/16.0≈3.33 mol
- Divide by Smallest:
- C:3.33/3.33=1
- H:6.7/3.33≈2
- O:3.33/3.33=1
- Relative Ratio: 1:2:1.
- Empirical Formula: CH2O.
This medium difficulty chemistry question is from the chapter purification and characterisation of organic compounds, covering the topic of molecular formula. It appeared in the 2025 exam.
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