10 kg of cold water at 2^(@)C absorbs 50J of heatfrom the surrounding which were at a temperature of37^(@)C . What is the entropy change of (i) the system (ii) the surroundings (iii) the universe ? Assumethe change in temperature of the water and the surroundings to be negligible.

10 kg of cold water at 2^(@)C absorbs 50J of heatfrom the surrounding

1.	10 kg of cold water at 2^(@)C absorbs 50J of heatfrom the surrounding which were at a temperature of37^(@)C . What is the entropy change of (i) the system (ii) the surroundings (iii) the universe ? Assumethe change in temperature of the water and the surroundings to be negligible.
Answer» Solution :`(i) DeltaS_("system") ("water")= ( +50J)/( 275K) = 0.18 JK^(-1)``(ii) DeltaS_("SURROUNDINGS") =( -50J)/(310K) = - 0.16 JK^(-1)` `(III) DeltaS_("universe") = DELTAS _("system") + DeltaS_("surroundings") = 0.18 + ( -.16) = 0.02 JK^(-1)`