BRAINCAKEHess's Law Example 10
Worked example: finding an unknown enthalpy change of formation
Hess's law can be used backwards. If ΔrHθ is known, the usual expression can be rearranged to find one missing ΔfHθ.
The first stage in making nitric acid is:
Sign in free to see the rest of this lesson, the R.E.C.I.P.E. recall steps and the quiz
BrainCake is free. Make an account in seconds and pick up where this page stops.
Key terms in this lesson
- enthalpy change of formation
- The enthalpy change when one mole of a compound is formed from its elements in their standard states, under standard conditions.
- hess's law
- The principle that the total enthalpy change for a reaction is the same regardless of the route taken, provided the starting and finishing conditions are the same.
More in Enthalpy
- Hess's Law Example 2
- Hess's Law Example 3
- Hess's Law Example 4
- Hess's Law Example 5
- Hess's Law Example 6
- Hess's Law Example 7
- Hess's Law Example 8
- Hess's Law Example 9
All 21 lessons in Enthalpy · All Edexcel AS-level Chemistry topics