CHEM - Calculating Percentage of Oxygen in Air
Chemistry, calculating percentage of oxygen in air - IGCSE | IBDP | DSE | GCE | AP Chemistry
The composition of air is approximately
For IGCSE Chemistry, you need to know how to experimentally determine the percentage of oxygen in air!!
(a) Why is there a change in the height of column of air?
(b) How do you calculate the percentage of oxygen in this sample of air?
percentage of oxygen = volume of oxygen used up ÷ volume of initial amount of gas x 100
= change in height of column of air ÷ initial height of column of air x 100
= (80 - 63) ÷ 80 x 100
The large pile of copper powder is heated, and the air in the syringe is passed several times from one gas syringe to the other. The large pile of copper powder turns black. The remaining gas is allowed to cool and its volume is measured.
(a) Explain why the large pile of copper turns black.
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