Calculate the entropy change in the system and surroundings and the total entropy change in the Universe during a process in which 245 J of heat flow out of the system at 77^@C to the surrounding at 33^@C.

Calculate the entropy change in the system and surroundings and the to

1.	Calculate the entropy change in the system and surroundings and the total entropy change in the Universe during a process in which 245 J of heat flow out of the system at 77^@C to the surrounding at 33^@C.
Answer» Solution :Given: `T_("SYS") = 77^(@)C = (77+273) = 350K` `T_("surr") = 33^(@)C = (33+273) = 306K` q=245J `DeltaS_("sys") = (q)/(T_("sys")) = (-245)/(350) = -0.7 JK^(-1)` `DeltaS_("UNIV") = (q)/(T_(sys")) = (+245)/(350) = +0.8JK^(-1)` `DeltaS_("univ") = DeltaS_("sys")+DeltaS_("surr")` `DeltaS_("univ") = -0.7JK^(-1)+0.8JK^(-1) = 0.1 JK^(-1)`