What mass of p2o5 is required to obtain 8.8 g of orthophosphoric acid? Write the reaction equation.

univerkov | July 14, 2021 | education

Reaction equation:
P2O5 + 3H2O = 2H3PO4.
1) Find the molar mass of phosphoric acid according to the periodic table: 3 + 31 + 64 = 98.
2) Find the amount of phosphoric acid substance. To do this, divide the mass of the acid by the molar mass: 8.8 / 98 = 0.09 mol.
3) According to the reaction equation, the amount of phosphorus oxide substance and phosphoric acid is 1: 2. This means that the amount of phosphorus oxide substance is: 2 * 0.09 = 0.18 mol.
4) Find the molar mass of phosphorus oxide: 31 * 2 + 16 * 5 = 142.
5) Mass of phosphorus oxide: 142 * 0.18 = 25.56 g – answer.

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