If there is an excess of air, the reaction should produce diphosphorus pentoxide as its only product. If additionally the phosphorus molecule is simply a phosphorus atom, the balanced equation is: 4 P + 5 O2 -> 2P2O5. If phosphorus is considered to form a tetraatomic molecule, the equation would be: P4 + 5 O2 -> 2 P2O5 Show Answer: The representation of a chemical reaction in the form of substances is known as a chemical equation. The equation in which the number of atoms of all the molecules is equal on both sides of the equation is known as a balanced chemical equation. P4 + 5O2 → 2P2O5 When four moles of phosphorus are burned with five moles of oxygen, two moles of P2O5 are released.  Articles to Explore:
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Which is the correct equation for the reaction that takes place when phosphorus combines with oxygen gas?
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