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Because the mass of the reactants equal to the mass of the product of a reaction, the number of moles will be conserved.

-I think this is sometime true but I don't know a way to prove that it sometime true. Anyone got an idea ? Thanks

  • Chemistry -

    It seldom is true.
    Fe+S=FeS (two moles=1?)
    2Fe+O2> 2FeO (three moles=2?)
    N2 + O2 > 2NO (two moles=2)

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