Question

What will be the balance chemical equation when phosphorus burns in oxygen to form phosphorus pentoxide?

Answer 1

P4+5O2= P4O10  [or]
4P+5O2= 2P2O5

Answer 2

When 4 mole of phosphorus burns with 5 mole of oxygen, it gives 2 mole of P2O5.

4P +5 O2 ==> 2P2O5

But when white phosphorus reacts with oxygen at 50℃ it gives 1 mole of P4O10.

4P + 5O2 ===> P4O10