Calculate the change in the entropy of the universe as a result of each of the f

Question

Calculate the change in the entropy of the universe as a result of each of the following processes.

a) A copper block of mass 0.4 kg and heat capacity 150 JK^-1mat 100 C is placed in a lake at 10 C.

b) The same block at 10 C is dropped from a height of 100m into the lake.

c) Two similar blocks at 100 C and 10 C are joined together.

d) One kilomole of gas at 0 C is expanded reversibly and isothermally to twice its initial volume.

e) One kilomole of a gas at 0 C is expanded reversibly and adiabatically to twicw its initial volume.

Explanation / Answer

(a)

?Suniverse = ?Sblock + ?Slake =

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