FC20: Enthalpy 2 Flashcards
1
Q
What is bond enthalpy
A
it is the energy needed to break one mole of a particular type of bond in molecules in the gaseous state
2
Q
Why are bond enthalpies usually average bond enthalpy values
A
bond enthalpies are averaged out over a range of compounds because the bond enthalpy for a particular bond may be different in different molecules
3
Q
What is the formula for calculating enthalpy change of a reaction
A
sum of bond enthalpies in reactants - sum of bond enthalpies in products
4
Q
What does Hess’s Law state
A
that the enthalpy change of a reaction is independent of the route taken, provided the starting and final conditions are the same
