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Question

Write the balanced equation when phosphorous burns in oxygen to form phosphorous pentoxide.


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Solution

Balanced chemical equation:

  • “A balanced equation for a chemical reaction is where the number of atoms and charge of each chemical element is equal in both reactants and products.”

The reaction between phosphorus and oxygen:

  • When phosphorus is made to burn in oxygen, it results in the formation of phosphorus pentoxide.
  • P4(s)+O2(g)P2O5(s)(Phosphorous)(oxygen)(Phosphorouspentoxide)

Element

Reactant side

Product side

P

4

2

O

2

5

  • Both phosphorus and oxygen are not balanced, by balancing the oxygen on the reactant and product side, the whole equation gets balanced.
  • P4(s)+5O2(g)heat2P2O5(s)(Phosphorous)(Oxygen)(Phosphorouspentoxide)

Element

Reactant side

Product side

P

4

4

O

10

10

  • Thus the balanced equation is as follows:
  • P4(s)+5O2(g)heat2P2O5(s)(Phosphorous)(Oxygen)(Phosphorouspentoxide)

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