Enthalpy Change Calculator
Turns a measured temperature change into a molar enthalpy change.
Enthalpy change ΔH
— kJ/mol
Share sends a link that reopens these numbers. Copy details pastes the full breakdown as a list.
Heat absorbed by the solution —
Temperature change — K
The reaction is —
Reading this —
The formula
q = m × c × ΔT ΔH = −q ÷ moles
The minus sign is there because heat gained by the solution is heat lost by the reaction.
What to watch out for
Use the total mass of the solution. For dilute solutions, 1 mL is about 1 g. A temperature change is the same size in kelvin as in degrees Celsius. To add up known enthalpies instead, use the Hess’s law calculator.
Frequently Asked Questions
What is ΔH if 100 g of solution warms by 6.5 K with 0.05 mol reacting?
-54.3 kJ/mol, which is exothermic.
What does a negative ΔH mean?
The reaction releases heat, so the surroundings warm up.