200 cm 3 of air was passed over heated copper in a syringe several times
CHEMISTRY
POST UTME UI
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 158 cm3 . Estimate the percentage of oxygen in the air.
- A) 31%
- B) 27%
- C) 21%
- D) 19%
Correct Answer: C) 21%
Explanation
Volume of O\(_2\) used = 200 - 158 = 42 cm\(^3\)
% of O\(_2\) = (42)/(200) x 100% = 21%
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