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problem:

a solid with constant heat capacity and initial temp To, is brought in contact with hotter reservoir temp T1 and allowed to come into equilibrium. This is all isolated.

a) is the change in the entropy of the universe negative zero or positive thanks to the systems process. explain why

b) calculate entropy change to solid

c) calculate entropy change to reservoir

a) i would have thought that the entropy change of the universe is zero because entropy change is dQ/T and the change in Q for both systems is the same (for the solid its +ve and reservoir -ve)

b) dS = dQ/To

c) dS = -dQ/T1

is this right?