Oh yeah that's what I was doing. You also have to multiply by the mass in order to cancel the units of grams so that your units are J/K. I guess then that I just don't understand the question that was similar or that its answer is wrong.Thanks for your help.
Homework Statement
A 10 gram block of iron metal (Sp=0.449 J/gK) at 400 K is placed in contact with a 20 gram block of aluminum (Sp=0.903 J/gK) at 300 K. Heat flows between the two until equilibrium is reached. Find the equilibrium temp and the change in entropy for the process.
Homework...