K vs Kc

[Annie Chantasirivisal_4G]

So, I understand the distinction between Kp and Kc, one for partial pressure and the other for concentration, but for table 5G.2, what is their difference? How would we know whether to use K or Kc when being referred to it by a textbook problem (such as 5.39)?

[Alicia Lin 2F]

I use the Kc for the concentration and treat K as I would for Kp.

[Isha_Maniyar_Dis2E]

I was also confused by this, but I'm assuming that you should use the most specific option. For example, if the question is specifically referring to concentration values, it would be best to use K_c rather than K, because that way you know it's specifically for concentration.