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`.

Explanation

Given
`T_"sys"=77^@C =(77+273)`=350 K
`T_"surr"=33^@C` =(33+273) =306 K
q=245 J
`DeltaS_"sys" =q/T_"sys" =(-245)/350=-0.7 JK^(-1)`
`DeltaS_"univ"=q/T_"sys" =(+245)/350=+0.8 JK^(-1)`
`DeltaS_"univ"=DeltaS_"sys" +DeltaS_"surr"`
`DeltaS_"univ"=-0.7 JK^(-1) + 0.8 JK^(-1)`
`DeltaS_"univ" =0.1 JK^(-1)`