Find the mass of phosphorus which contains in phosphorus oxide weighing = 28.4 g.

univerkov | February 9, 2021 | education

1. Let’s find the mass fraction of phosphorus in phosphorus oxide through the relative atomic mass:

ω (P) = 2Ar (P) / Mr (P2O5) * 100% = 2 * 31 g / mol / 142 g / mol * 100% = 43.66%.

2. Find the mass of phosphorus in a portion of the oxide:

m (P) = ω (P) * m (P2O5) / 100% = 43.66% * 28.4 g / 100% = 12.4 g.

Answer: m (P) = 12.4 g.

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