A brass rod is in thermal contact with a heat reservoir at 12 7 ∘ C at one end and a heat reservoir at 2 7 ∘ C at the other end. Find the total change in entropy arising from the process of conduction

Question

A brass rod is in thermal contact with a heat reservoir at 12 7 ∘ C at one end and a heat reservoir at 2 7 ∘ C at the other end. Find the total change in entropy arising from the process of conduction of 1200 cal of heat through the rod. (Assume steady state of heat transfer through rod)

TestHub · Accepted Answer

Δ S ( hot reservoir ) = 273 + 127 − 1200 ​ = − 3 cal K − 1 Δ S ( cold reservoir ) = 273 + 27 + 1200 ​ = 4 cal K − 1 ∴ Δ S ( net change ) = − 3 + 4 = 1 cal K − 1 . No change in entropy of the rod itself (steady state) hence (B).

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