In combustion reactions, some substances will release more energy than others. Enthalpies of combustion can be used to compare which fuels or substances release the most energy when they are burned.

A solution was made by dissolving a spatula of potassium nitrate into 50 cm 3 of water. The temperature changed from 20.4˚C to 18.7˚C. Calculate the enthalpy change for this reaction. To calculate the ...