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The formula for heat can be either q=nCT where n stands for the number of moles, or it can be q=mCT where m stands for the mass in grams. The formula you use will depend on whether the specific heat capacity (C) is given as J/gK where you would use q=mCT or if it is given as J/molK where you would use q=nCT.
^^^ like they said, pay attention to the specific heat given. If you are given molar heat capacity (Cm), you use moles (n). If you are given specific heat capacity (Csp), then use grams. Make sure the units match!
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