The interaction of phosphorus weighing 3 grams with oxygen formed phosphorus oxide five. Find its mass?

univerkov | April 30, 2021 | education

4P + 5O2 = 2P2O5
According to the periodic table, we determine the molar masses: M (P) = 31 g / mol; M (P2O5) = 31 * 2 + 16 * 5 = 142 g / mol.
The amount of phosphorus substance: n = m / M = 3 g / 31 g / mol = 0.097 mol.
According to the reaction from 4 mol of phosphorus, 2 mol of phosphorus oxide is obtained, then n (P2O5) = 0.097 * 2/4 = 0.0485 mol.
Oxide mass: m = n * M = 0.0485 mol * 142 g / mol = 6.887 g.
Answer: the mass of the oxide is 6.887 g.

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