Skip to content
Clear highlightsClear Highlight Report a problem

Hess's Law

If a reaction can take place by two routes the total enthalpy change for each route is the same provided that the starting and finishing conditions are the same.Hess's Law is a consequence of the law of Conservation of Energy.For the formation of ethanol, 2C(s) + 3H2(g) + ½O2(g) → C2H5OH(l), ΔHr = 2ΔHc(carbon) + 3ΔHc(hydrogen) - ΔHc(ethanol)

Read the text

Read the text and highlight anything you think is important. When you go on, the text is hidden and you answer from memory.

Next

Specification: Edexcel Chemistry (8CH0), AS-level, Topic 8: Energetics I. Topic: Enthalpy.

More in Enthalpy

All 21 lessons in Enthalpy · All Edexcel AS-level Chemistry topics