Find the mass of phosphorus oxide (5) formed by burning 62g of phosphorus.

The phosphorus combustion reaction is described by the following chemical reaction equation:

2P + 2.5 O2 = P2O5;

From two moles of phosphorus, one mole of its oxide is formed.

Let’s determine the amount of substance in 62 grams of phosphorus.

M P = 31 grams / mol;

N P = 62/31 = 2 mol;

Let us determine the mass of 2 mol of phosphorus oxide.

M P2O5 = 31 x 2 + 16 x 5 = 142 grams / mol;

m P2O5 = 2 x 142 = 284 grams;