Textbook 5I.19

[405745446]

For this problem I'm not sure what I am supposed to do with this piece of information in the problem: "60% of the hydrogen gas had reacted"
I'm running under the assumption that I need this information to finish the ICE table. How do I interpret this problem and set it up properly to find Kc.

Thank you!

[Noah Ho 1F]

If you know the original amount of H2, you know the change of the H2 gas concentration, which is 60% of the original concentration. You would also know the remaining concentration at equilibrium, which would be 40% of the original concentration. Since the change in concentration will be the same, assuming everything has a stoichiometric coefficient of 1, you know how much you need to add or subtract from each reactant/product, which will help you get your equations for finding the equilibrium concentrations. (If the coefficients aren't one, you would multiply the change by 2 or whatever number with respect to the coefficient in front of h2).