What mass of phosphorus is needed to obtain 71g. phosphorus (V) oxide?
| October 7, 2021 | education
The equation for the reaction of phosphorus with oxygen:
4P + 5O2 = 2P2O5
The amount of substance P2O5:
v (P2O5) = m (P2O5) / M (P2O5) = 71/142 = 0.5 (mol).
According to the reaction equation, 2 mol of P2O5 is formed from 4 mol of P, therefore:
v (P) = v (P2O5) * 4/2 = 0.5 * 4/2 = 1 (mol).
Thus, the required mass of phosphorus:
m (P) = v (P) * M (P) = 1 * 31 = 31 (g).
Answer: 31 g.
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