At equilibrium, the concentrations are [H2] = 5.0 M, [N2] = 10 M, and [NH3] = 3.0 M. What were the concentrations of nitrogen gas and hydrogen gas that were reacted initially?

Explanation:

Hello,

In this case, by computing the equilibrium constant considering the law of mass action of the undergoing chemical reaction we obtain:

Now, the ICE table turns out:

Now, the change "" due to the reaction is computed via the equilibrium concentration of ammonia as shown below:

Therefore, the initial concentrations result:

Best regards.