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In a reaction, do moles have to be balanced?

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No. Only the total number of atoms of all types and the electrical charge must be identical on both sides. read more

Only the total number of atoms of all types and the electrical charge must be identical on both sides. A good example of a reaction where moles are not balanced is the equilibrium between nitrogen oxides 2 NO [math]_2[/math] <-> N [math]_2[/math] O [math]_4[/math]. read more

What this means is that chemical equations are not just balanced in terms of molecules; they are also balanced in terms of moles. We can just as easily read this chemical equation as “two moles of hydrogen react with one mole of oxygen to make two moles of water.” All balanced chemical reactions are balanced in terms of moles. read more

The heart of the answer lies in a balanced equation and the mole-mole conversion factors that spring from it. For every mole of nitrogen reactant, a chemist expects 2 moles of ammonia product. read more

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