How many moles of phosphorus are required to react with 100 g oxygen?

Question

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

Answer 1

Standard stoichiometry, using mole ratios from the balanced reactions:

(100g O₂) * (1 mol O₂ /32.0g O₂) * (4 mol P /5 mol O₂) = 2.50 moles of Phosphorus.