Calculate the entropy change in the system , and surroundings , and the total entropy changes in the universe during a process in which 245 J of heat flow out of the system `77^(@)C` to the surrounding at `30^(@)C.`

Explanation

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