CalculatorHand-checked fixturesFull working shown
Hess's Law Calculator
Combine known reaction enthalpies — reversed steps flip signs; multiplied steps scale ΔH.
Calculator
Results update as you type. Every step of the working is shown below.
Examples:
Result
Enter values above — the answer appears here instantly, with full working.
Formula used
ΔH_target = Σ kᵢ · ΔHᵢ
Every result substitutes your values into this relation step by step above.
Assumptions
- Steps sum to the overall target equation (species must cancel).
- Enthalpies are state functions — path independent.