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Two objects at different temperatures are placed in a perfectly insulated calorimeter. When the system reaches equilibrium, which of the following statements is true? Assume these objects do not undergo a chemical reaction.

a) Tfinal must be less than Thot

b) Tfinal must be greater than Tcold

c) Tfinal can be equal than Tcold

d) Tfinal must be the average of Thot and Tcold

e) Tfinal can be greater than Thot

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