2.8.3 Hess's Law

Question 1

What can be constructed using Hess’s law?

Answer 1

Enthalpy cycles

Question 2

What direction do the arrows go in the enthalpy cycle using formation data?

Answer 2

Up, from the elements to the products and reactants

Question 3

What direction do the arrows go in enthalpy cycles using combustion data?

Answer 3

Down, from the reactants and products to the products

Question 4

What does Hess’s law state?

Answer 4

‘If one reaction can occur by more than one route, the overall enthalpy change is independent of the route taken’