What mass of molecular oxygen when reacted with excess phosphorus will produce 143.33g P4O6?

Question

The balanced equation is 4P+3O2+ P4O6

Can some one show me how set up the problem to find the answer?

Answer 1

ok you have 143.33 g P4O6 produced
you need to find the number of moles so divide that by the molar mass.
you need 3 moles of O2 (molecualr oxygen) to make one mole of P4O6 so take the moles of P4O6 and multiply it by 3 to get the moles of O2

143.33 g / (MW g/mol) = mol P4O6
mol P4O6 * 3 mol O2/1mol P4O6 = mol O2