BRAINCAKEDetermination of Enthalpy Change of a Reaction from Enthalpies of Combustion using Hess's Law
For the formation of butane from its elements in their standard states,
4C(s) + 5H2(g) → C4H10(g)
The enthalpy of formation of butane would be impossible to measure because carbon and hydrogen form so many compounds alongside butane.
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
- A measure of the total energy of a chemical system.
More in Enthalpy
- Determining the Enthalpy Change of a Reaction
- Cooling Curves
- Average Bond Enthalpy
- Calculating Enthalpy Changes from Bond Enthalpies
- Limitations of Bond Enthalpy Calculations
- Hess's Law
- Determination of Enthalpy Change of a Reaction from Enthalpies of Formation Using Hess's Law
- Exam-style Question
All 19 lessons in Enthalpy · All OCR AS-level Chemistry topics