We first have to find Q calorimeter
Q calorimeter = C (delta T)
C= heat capacity in J/oC, not small c ( specific heat capacity)
delta T= change in T (oC) = final T - initial T
Q calorimeter = 10.4 J/oC (30 oC - 25 oC)
Q calorimeter = 52 J
Remember,
Q calorimeter = - Q surrounding
The (-) negative sign stands for heat being released.
So ,
Q surrounding = - 52 J
In other words, the iron releases 52 J .
The calorimeter absorbs the entire 52 J and heat rose from 25 - 30 oC.
Answer: 52 J
