Question on: JAMB Chemistry - 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?
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%
% of O2 = (42)/(200) x 100% = 21%
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