The air contains 21% oxygen and 78% nitrogen by volume. Calculate the volume of oxygen

| August 7, 2021 | education

The air contains 21% oxygen and 78% nitrogen by volume. Calculate the volume of oxygen and nitrogen in 250 liters of air. Determine the amount of substance and mass for each gas.

The air volume is 250 liters.

Mass fraction of oxygen – 21%.

Mass fraction of nitrogen – 78%.

Let’s determine the amount and mass of each of the substances.

Let’s determine the volume of oxygen.

250 liters of air is 100%.

Chl oxygen is 21%.

X = 52.5 liters.

Let’s determine the amount of oxygen.

n = 52.5 / 22.4 = 2.34 mol.

Let’s determine the mass of oxygen.

m = 32 * 2.34 = 75 g.

Let’s determine the volume of nitrogen.

250 liters of air is 100%.

Chl of nitrogen is 78%.

X = 78 * 250: 100 = 195 liters.

Let’s determine the amount of substance and the mass of nitrogen.

n = 195 / 22.4 = 8.7 mol.

m = 8.7 * 28 = 24.4 g.



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