How many moles of phosphoric acid can be formed from 3000 g of diphosphorus pentoxide?

42.2 moles of H3PO4

Explanation:

The equation of the reaction is:

P2O5 (s) + 3 H2O (l) ⟶ 2 H3PO4.

First we must obtain the number of moles of P2O5 from

Number of moles of P2O5 = reacting mass of P2O5/molar mass of P2O5

Molar mass of P2O5 = 141.9445 g/mol

Number of moles = 3000g/141.9445 g/mol = 21.1 moles of P2O5

From the reaction equation;

1 mole of P2O5 yields 2 moles of H3PO4

21.1 moles of P2O5 will yield 21.1 * 2 / 1 = 42.2 moles of H3PO4