BRAINCAKEHess's Law Example 4
Worked example: a reaction that cannot be measured directly
Calcium carbonate only decomposes when heated strongly, so its enthalpy change cannot be measured with simple calorimetry. Hess's law lets us calculate it from enthalpy changes of formation.
CaCO3(s) → CaO(s) + CO2(g)
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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
- Enthalpy Change of a Reaction
- Hess's Law
- Hess's Law Example 2
- Hess's Law Example 3
- Hess's Law Example 5
- Hess's Law Example 6
- Hess's Law Example 7
- Hess's Law Example 8
All 21 lessons in Enthalpy · All Edexcel AS-level Chemistry topics