CHEMISTRY COMMUNITY

How do you know when to use K and Kc because in the homework, there are some problems where the reactants and the products are all gases, but I get it wrong because I used Kc instead of K and vice versa? Also, is it true that the larger K is, the more stable the reaction?

When the problem has has K, it's usually implicit that they are referring to or . You would just have to pay attention to the units in which the initial concentration/pressures are given. If they give the initial numbers with the units M (molarity) you will know that the problem is referring to rather than . If the initial numbers are given with units of pressure (bar, atm, etc.) you know the problem is referring to rather than .