12.4g of phosphorus reacts with 9.6 g of oxygen what is the blanced chemical equation?

The balanced chemical equation :

P₄+3O₂⇒P₄O₆

A compound consists of the mole ratio of the constituent components

12.4 g of phosphorus, mol :

9.6 g of oxygen, mol :

the mole ratio of the compound resulting from the reaction of phosphorus and oxygen :

P : O = 0.4 : 0.6⇒ 4 : 6

The compound formula :

P₄O₆

So the reaction (balanced) :

Usually this reaction occurs when phosphorus reacts with a small amount of oxygen instead of excess oxygen(for excess oxygen, the compound produced :P₄O₁₀)

law of conservation of matter

it's all four options.