Physics

Problem

Two identical

0.50\,\text{kg}

blocks of copper (specific heat capacity

c = 385\,\text{J}\,\text{kg}^{-1}\,\text{K}^{-1}

) are initially at

450\,\text{K}

and

350\,\text{K}

, respectively. The blocks are placed in thermal contact inside an insulated container and reach a common final temperature of

400\,\text{K}

. Calculate the total entropy change of the two-block system and state whether the process is reversible or irreversible based on your result.