1
Q
What does Hess’s Law state?
A
The enthalpy change of a reaction is independent of the route taken.
2
Q
Define standard enthalpy of formation.
A
The enthalpy change when one mole of a compound is formed from its constituent elements in standard conditions, with all products and reactants in their standard states.
3
Q
What is the standard enthalpy of an element.
A
Zero, By definition.
4
Q
Define standard enthalpy of combustion.
A
The enthalpy change when one mole of a substance is completely burnt in excess oxygen.
AQA A level Chemistry Y2
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