How many grams of phosphorus (V) oxide will be obtained by burning 3.1 grams of phosphorus in oxygen?

univerkov | May 30, 2021 | education

4P + 5O2 = 2P2O5.

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

M (P) = 31 g / mol.

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

3.2 g phosphorus – x g phosphorus oxide.

31 * 4 g / mol – 2 * 142 g / mol.

X = 3.2 * 2 * 142 / (31 * 4) = 7.3 g.

Answer: the mass of phosphorus is 7.3 g.

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