We usually think of putting "reactants" into a reaction vessel and forming "products". By definition this is true. However the reactants may not always be listed on the left side of the reaction as you expect. For example it is possible to place all three species of our equilibrium into the reaction vessel and allow an equilibrium to form. It is probably best to make this point by working some problems. Place 2 moles of N2, H2, and 4 moles of NH3 into the reaction vessel and press "equilibrate".

Write down the equilibrium table that you would use to solve this problem.

Write down the mathematical equation that you would have to solve in order to get the equilibrium concentrations of each of the substances.

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