Empirical And Molecular Formula
A compound contains 40% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. Its empirical formula is:
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About This Question
- Subject
- chemistry
- Chapter
- some basic concepts in chemistry
- Topic
- empirical and molecular formula
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
CH₂O
- Moles Calculation (assuming 100g):
- C:40/12≈3.33 mol
- H:6.7/1=6.7 mol
- O:53.3/16≈3.33 mol
- Atomic Ratio (Divide by smallest, 3.33):
- C=3.33/3.33=1
- H=6.7/3.33≈2
- O=3.33/3.33=1
- Result: Empirical formula is CH2O.
This medium difficulty chemistry question is from the chapter some basic concepts in chemistry, covering the topic of empirical and molecular formula. It appeared in the 2025 exam.
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