Question

Dry air is passed over oxygen till all the oxygen has reacted

Answer 1

Answer:

The percentage of oxygen in the air can be measured by passing a known volume of air over hot copper, and measuring the decrease in volume as the oxygen reacts with it. Here are the equations for this reaction:

copper + oxygen → copper oxide

2Cu(s) + O2(g) → 2CuO(s)

Gas syringes are used to measure the volume of gas in the experiment. The slideshow shows there is 100 cm3 of air at the start:- (Above Image)

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Answer 2

Explanation:

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