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What specific heat capacity is to be used for an ideal gas when there are changes in P, V, and T as pressure and volume are both not constant? Is it even possible for all three to be changed together?
It is not possible for all three to change simultaneously. When T changes, you use the formula with the heat capacity. The problem would tell you if the reaction is under constant P or V, then you would know which heat capacity to use.
I'm in agreement with the statement above - we're probably not going to be asked for all three to change because that would be impossible to calculate with what we know about heat capacities for ideal gases.
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