Developing Fuels: Hess's Law Flashcards
1
Q
What is Hess’s law
A
The enthalpy change for a reaction is independent of the route taken
2
Q
What is the enthalpy change equation used when given enthalpies of formation
A
Delta H = ( sum of delta(f) H PRODUCTS ) - ( sum of delta(f) H REACTANTS)
3
Q
What is the delta(f) H of all elements ( in their standard state)
A
0
4
Q
What is the enthalpy change equation used when given enthalpies of combustion
A
Delta H = ( sum of delta(c) H REACTANTS ) - ( sum of delta(c)H PRODUCTS )
5
Q
How do enthalpy cycles work for combustion
A
Arrows with enthalpies on them coming from formation equation to combustion equation
6
Q
How do enthalpy cycles work for formation
A
??? Arrows with enthalpies on them coming from combustion equation to formation equation
