What is the mass of phosphorus (V) oxide obtained by burning 2 mol of red phosphorus?

This year you need to determine the mass of the resulting phosphorus oxide. First, we write down the equation of a chemical reaction.

4P + 5O2 = 2P2O5.

Let’s make a proportion and determine the molar mass of phosphorus oxide.

2 mol of phosphorus – x mol of phosphorus oxide.

4 mol – 2 mol.

X = 2 * 2/4 = 1 mole of phosphorus oxide.

Next, you need to determine the mass of phosphorus oxide. First, determine the molar mass.

M (P2O5) = 2 * 31 + 5 * 16 = 142 g / mol.

Let’s apply the following formula.

m = n * M.

m = 1 * 142 = 142 g.

This means that the mass of phosphorus oxide is 142 g.

Answer: 142 g.