What mass of P2O5 is produced from 154 g p?

Question

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

Answer 1

Use the stoichiometry of the balanced equation along with dimensional analysis to answer the question:

molar mass P₂O₅ = 141.9 g/mol

atomic mass P = 30.97 g/mol

154 g P x 1 mol P / 30.97 g x 2 mol P₂O₅ / 4 mols P x 141.9 g P₂O₅ / mol P₂O₅ = 353 g P₂O₅ (3 sig. figs.)

Answer 2

154g P x (1 mol / 123.88g) = 1.24 mol P

1.24 mol P x (2 mol P₂O₅ / 4 mol P) = 0.62 mol P₂O₅

0.62 mol P₂O₅ x (141.94g / 1 mol) = 88g P₂O₅

**Note: I am not sure if these are the correct molar masses, so I would double check that they are the correct molar masses you are required to use. If they are not correct, you can still use this set up, but simply change the molar masses.