Make the equation for the reaction of phosphorus combustion (this produces phosphorus oxide (V) P2O5)

Make the equation for the reaction of phosphorus combustion (this produces phosphorus oxide (V) P2O5) and calculate whether 10 g of oxygen is enough to burn 6.2 g of phosphorus

1) Let’s write the equation of the phosphorus combustion reaction and arrange the coefficients:
4P + 5O2 = 2P2O5
2) Find the theoretical mass of phosphorus:
m = M * n = 31g / mol * 4mol = 124g
3) Find the theoretical mass of oxygen:
m = M * n = 32g / mol * 5mol = 160g
4) Let’s make the proportion: 6.2 / 124 = x / 160
x = 8g oxygen is required for this reaction, 10 is more than 8, oxygen in excess
The answer is yes, that’s enough.