How to calculate delta s surroundings? calculate delta s(surr) at the indicated temperature for a reaction having each of the following changes in enthalpy. the first problem is delta h rxn = -283 kj; 298 k. can anyone walk me through this so i can do all of them? how do i calculate delta s(sys)?

You can use the equation ΔS(surr)=q(surr)/T or ΔS(surr)=-q(rxn)/T.
the two equations are equal since we know that the energy the system (reactoin) puts out just goes into the surroundings.  
(In other words q(surr)=-q(rxn))

Using the equation, ΔS(surr)=-(-283kJ/298K)=0.9497kJ/K or 949.7J/K

This answer makes sense since the reaction is exothermic which means it released energy into the system which usually causes the entropy to increase.

I hope that helps.