# How much oxygen is required to completely burn 124 g of phosphorus?

How much oxygen is required to completely burn 124 g of phosphorus? What mass of phosphorus oxide is formed in this case?

The combustion reaction of phosphorus is described by the following chemical reaction equation.
2P + 5/2 O2 = P2O5;
The phosphorus oxide molecule consists of 2 phosphorus atoms and 5 oxygen atoms. When 2 moles of phosphorus are burned, 1 mole of its oxide is formed. This requires 2.5 moles of oxygen. Since in the oxide molecule there are 5 oxygen atoms, and in the oxygen molecule there are 2 oxygen atoms.
Find the amount of substance in 6 grams of phosphorus.
M P = 31 grams / mol;
N P = 124/31 = 4 mol;
The required amount of oxygen will be:
N O2 = N P x 5/2 = 4 x 5/2 = 10 mol

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