Calories is a unit of energy, so we need to calculate the energy or heat absorbed or released by the system. We use the equation:
U = mCpΔT
where:
m = mass of material
Cp = specific heat capacity of material
ΔT = (Tf - Ti) = temperature change
First, you must look for the specific heat capacity of copper. You can use any chemistry or engineering book or website. According to Engineering Toolbox, the specific heat capacity of copper is 0.09 cal/(g-°C).
U = 200(0.09)(33-28) = 90 calories
Since the value is positive, energy is absorbed.
