▸ΔH = -2,220 kJ, the process is exothermic.
- A negative ΔH means the system releases 2,220 kJ of heat to the surroundings, which warm up.
- That is -530.59 kcal or -2,104.1 BTU of the same energy.
- At constant pressure, ΔH equals the heat exchanged (q_p), making it the natural energy bookkeeping for open-beaker chemistry and HVAC loads.
Next stepPair ΔH with the entropy change ΔS to find the Gibbs free energy ΔG = ΔH − TΔS and judge spontaneity.