CH-1274
Composition of air
Chemistry · Secondary 4 · Medium · Composition of air
A 200 sample of clean, dry air is passed over excess hot copper until all the oxygen is removed. The final gas volume is 160 .
What percentage of the original air sample was oxygen?
What percentage of the original air sample was oxygen?
- 16 %
- 20 %
- 25 %
- 40 %
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