Answer:
4 moles of H3PO4
Explanation:
Molar mass of P4O10 = 284 g/mol
Number of moles of P4O10 reacted = 284g/284 g/mol = 1 mole of P4O10
From the reeaction equation;
1 mole of P4O10 yields 4 moles of H3PO4
Hence, 284 g of P4O10 yields 4 moles of H3PO4