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You use Kc or Kp based on the information that is given and what the question is asking for. For example, if you are given gases and their molar concentrations, you can use Kc. However, if the question requires you to calculate Kp, use the Ideal Gas Law to convert Kc to Kp.
Use Kp when even partial pressures and Kc when given concentrations. You can convert using PV=nRT and can also convert between Kp and Kc but that is more complicated, but is necessary when you are given Kp and concentration values (or the other way around).
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