Heat and Enthalpy Question

[Isis_DW_3G]

Could someone explain how to do this? I created 2 q=mcAT equations, one for each iron rod and then once I found the T2 i plugged it back into a q=mcAt equation to get q. For q i got 34, which i assume is close enough to 33.7, but was this approach correct? From there, how do we get delta S? Thanks!

[Zaid Bustami 1B]

Yup that approach is correct, exactly what I'd do too. Assuming no heat escapes into the surroundings, total entropy change for the process would be equivalent to asking for the sum of the entropy changes for each iron rod. The entropy change that occurs when temperature changes is given by this equation:

So what you'd do to find total entropy change is to add two of these equations together, one for each rod.