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Yes you can use Kc when everything is in gas phase. It makes calculations easier, and you won't have to convert back and forth from Kp to Kc or Kc to Kp. And yes we would have to use pV=nRT to convert. Remember that concentration= n/V
@804994652 , K can refer to either one and does not refer to one "more often". Either Kc or Kp can be written as just a general K as well; it is just important to use the information given in the problem to find the one asked for or that is easier to find using the given information.
According to the textbook, technically if you are asked for K and everything is in gas phase, you’re supposed to write it with partial pressures. However, the problem will likely specify which they are looking for, or will give values in concentration or partial pressure. In the event they give you something in the gas phase and something that is aqueous, for example, always use concentration.
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