A large block of copper initially at 20.0C is placed in a vat of hot water (80.0C).

Question:

A large block of copper initially at 20.0°C is placed in a vat of hot water (80.0°C). For the first 1.0 J of heat that flows from the water into the block, find
(a) The entropy change of the block,
(b) The entropy change of the water, and
(c) The entropy change of the universe. The temperatures of the block and water are essentially unchanged by the flow of only 1.0 J of heat.