What mass of P2O5 is produced from 45 g p?

Question

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

Answer 1

Hello, Jake,

The balanced equation tells us we'll get 2 moles of P₂O₅ from 4 moles of P. Find out how many moles of phosphorous we have in 45g by dividing the 45g by the molar mass of P, which is 31 grams/mole.

That gives us 45grams/31 grams/mole = 1.45 moles P

This means we'll produce 1/2 that amount of P₂O₅, or 0.726 moles P₂O₅

Convert that into grams by multiplying by the molar mass of P₂O₅ of 142 grams/mole

(0.726 moles P₂O₅)*(142 grams/mole P₂O₅) = 103 grams P₂O₅

Bob