200 cm3 of air was passed over heated copper in a syringe several times to
CHEMISTRY
JAMB 1997
200 cm3 of air was passed over heated copper in a syringe several times to produce copper (II) oxide. When cooled, the final volume of air recorded was 158cm3. Estimate the percentage of oxygen in the air?
- A. 31%
- B. 27%
- C. 21%
- D. 19%
Correct Answer: C. 21%
Post an Explanation Or Report an Error
If you see any wrong question or answer, please leave a comment below and we'll take a look. If you doubt why the selected answer is correct or need additional more details? Please drop a comment or Contact us directly. Your email address will not be published. Required fields are marked *