A 2.0kg copper block initially at 473K is gently lowered into a very large lake whose temperature remains constant at 293K. The specific heat capacity of copper is 386Jkg−1K−1. The lake is so large that its temperature change is negligible.
(i) Calculate the heat lost by the copper block while it cools to the lake temperature.
(ii) Determine the entropy change of the copper block.
(iii) Find the entropy change of the lake.
(iv) Obtain the net entropy change of the universe and comment on whether the cooling of the block is a reversible or irreversible process.