9.4 - Hess's Law & Enthalpy Cycles Flashcards Preview

OCR A Chemistry A Level - Chapter 9 > 9.4 - Hess's Law & Enthalpy Cycles > Flashcards

Flashcards in 9.4 - Hess's Law & Enthalpy Cycles Deck (3)
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1

Define Hess's Law

If a reaction can take place via 2 routes, and the starting and finishing conditions are the same, the total enthalpy change is the same for each route.

2

If enthalpy change of combustion is,
reactants > products,
denoted by A, what is the formula for the indirect route?

A = B-C

3

If enthalpy change of formation is,
reactants > products,
denoted by A, what is the formula for the indirect route?

A = C-B