1. Find the volume ( cm3) of oxygen in: a. 1000cm3 of air b. 50 cm3 of air.

A. 210 cm³

B. 10.5 cm³

Explanation:

It is important for us to note that air contains 21% of oxygen, O2. With this idea in mind, let us answer the questions given above.

A. Volume of air = 1000 cm³

Volume of O2 in air =.?

Percentage composition of O2 in air = 21%

Volume of O2 = 21% x 1000

Volume of O2 = 21/100 x 1000

Volume of O2 = 210 cm³

Therefore, the volume of O2 in 1000 cm³ of air is 210 cm³.

B. Volume of air = 50 cm³

Volume of O2 in air =.?

Percentage composition of O2 in air = 21%

Volume of O2 = 21% x 50

Volume of O2 = 21/100 x 50

Volume of O2 = 10.5 cm³

Therefore, the volume of O2 in 50 cm³ of air is 10.5 cm³.

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