How much oxygen is consumed to burn 5 g of phosphorus?

The interaction of phosphorus with oxygen is described by the following chemical reaction equation:

4P + 5O2 = 2P2O5;

Let’s determine the chemical amount of phosphorus. To do this, divide its weight by the weight of 1 mole of the substance.

M P = 31 grams / mol;

N P = 5/31 = 0.161 mol;

With such an amount of phosphorus, 0.161 x5 / 4 = 0.2 mol of oxygen will react.

Let’s calculate its volume.

To do this, multiply the amount of the substance by the volume of 1 mole of the substance (which is 22.4 liters).

V O2 = 0.2 x 22.4 = 4.51 liters;