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Use the one that is easiest to use, I'm assuming. If they give you grams then use m and if they give you mols use n. Just make sure to then use the corresponding C. Write out your units to ensure you're getting the right answer and everything cancels out.
Q=mcdeltaT can be used for any solid, liquid or gas, but specifically for gases, if you have constant volume, you can use the equation, nCvdeltaT, or constant pressure, nCpdeltaT. Cv and Cp both are called molar heat capacities.
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