What is the maximum amount in moles of P2O5 that can theoretically be made from 112 g of P4 and excess oxygen?

1.808 moles

Explanation:

The equation is: - 4P + 5 O2 = 2 P2O5

Number of moles = Mass of substance / Mass of one mole

Given, mass of P₄ = 112 g

Mass of one mole of P₄ = 30.97 g/mol

So, number of moles of P₄ = 112 / 30.97 = 3.616 moles

For 2 moles of P₂O₅, the number of moles required for P₄ will be 4 moles.

∴ Number of moles of P₂O₅ = 1/2 * (number of moles of P₄)

=1/2 * (3.616) = 1.808 moles

So, maximum amount of moles required is 1.808 moles