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# A block of copper at a temperature of $50^{\circ} \mathrm{C}$ is placed in contact with a block of aluminum at a temperature of $45^{\circ} \mathrm{C}$ in an insulated container. As a result of a transfer of 2500 J of energy from the copper to the aluminum, the final equilibrium temperature of the two blocks is $48^{\circ} \mathrm{C}.$ What is the approximate change in the entropy of the Universe?

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Change of entropy in the Universe is the sum of these previous two:

\begin{align*} \Delta S &= \Delta S_{\text{Al}} + \Delta S_{\text{C}} \\ \Delta S &= 7.86 - 7.74 \\ \Delta S &= 0.12 \, \text{J/K.} \end{align*}

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