200 cm3 of air was passed over heated copper in... - JAMB Chemistry 1997 Question
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%
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Correct Option: C
Volume of O2 used = 200 - 158 = 42 cm3
% of O2 = (42)/(200) x 100% = 21%
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