When elemental phosphorus, P4, burns in oxygen gas, it produces an intensely bright light, a great deal of heat, and massive

Question

When elemental phosphorus, P4, burns in oxygen gas, it produces an intensely bright light, a great deal of heat, and massive clouds of white, solid phosphorus(V) oxide (P₂O5) product. Given these properties, it is not surprising that phosphorus has been used to manufacture incendiary bombs for warfare. Choose the unbalanced equation for the reaction of phosphorus with oxygen gas to produce phosphorus(V) oxide.
P₂O5 (s)→ P4(s) + O2(g)
P₂O5 (8) + P4 (8) → O2(g)
P4(s) + O2(g) → P2O5 (8)
P4(s) → P2O5 (8) + O2(g)

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