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**1. Homework Statement**

Calculate the changes in total entropy of the universe as a result of the following processes:

(a) A block of mass 6kg and heat capacity of 300 J/K/kg at 150oC is placed in a lake at 0oC.

**2. Homework Equations**

**3. The Attempt at a Solution**

I think I have found the entropy change of the block as -788 J/K. I am not sure how to find the entropy change of the lake though as I don't know the mass.

Thanks for any help.