Entalpy Changes of Reaction

Kalor of reaction can be determining through experiment with kalorimeter. Kalorimeter is a isolated system [there is no material or energy that exchange with surrounding outside kalorimeter]. So that, all of the kalor which be freed by reaction which happens in the kalorimeter, is not expelled to outside kalorimeter.

We can determining value of kalor which is absorbed by water with measuring the increasing of temperature [T] in the kalorimeter based on the formula:

q _larutan = m c T