An aluminum bar of mass 2.00 kg at 300 degrees C is thrown into a lake. The temperature of the water in the lake is 15.0 degrees C; the specific heat capacity of aluminum is 900 J/(kg* K).(adsbygoogle = window.adsbygoogle || []).push({});

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.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Help entropy question

**Physics Forums | Science Articles, Homework Help, Discussion**