Reaction 5

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In the figure it is shown the evolution of a gaseous system at constant temperature from the initial state(left) to the final state (right).

 

 

 

If the atoms A are represented as blue spheres and atoms B by white spheres, what is the chemical equation for the process?

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AB3 ⇄ AB2 + B2	Wrong. This chemical equation is not correct. The number of B atoms doas not remain contant in both sides
6AB3 ⇄ 4AB2 + 6B2	Wrong. This chemical equation is not correct. The number of atoms increase.
4AB3 ⇄ 4AB2 + 2B2	Wrong. This chemical equation is not correct. It does not use the correct stoichiometric coefficients.
2AB3 ⇄ 2AB2 + B2	Right. The chemical equation is correct. Two molecules of AB3 are transformed in two of AB2 and one of B2.