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The bar eventually reaches thermal equilibrium with the lake. What is the entropy change DeltaS_lake of the lake? Assume that the lake is so large that its temperature remains virtually constant.

Express your answer numerically in joules per kelvin.

The change in Q of the Lake, heat absorbed by the lake is = 5.13*10^5 J

When there is a heat transfer of change in Q to a substance at constant temperature T, the entropy change DeltaS of the substance is given by

\Delta S={\Delta Q}/{T},

where T is absolute temperature.