Topic 8: Introduction to energetics Flashcards
1
Q
Enthalpy change
A
The heat energy change measured at conditions of constant pressure
2
Q
Standard enthalpy of combustion
A
The enthalpy change when one mole of substance in burned completely in oxygen under standard conditions
3
Q
Standard enthalpy of formation
A
The enthalpy change when one mole of a compound is formed from its elements under standard conditions, with all reactants and products in their standard states
4
Q
What are the standard conditions
A
100 kPa (1 atm) 298K (25 degrees celcius)
5
Q
Equation to find the energy change in a reaction
A
q=mcΔT
6
Q
Equation for the molar enthalpy change
A
ΔH= q/n
7
Q
What is Hess’s law
A
The enthalpy change of a reaction is independent of the route taken and depends only on the initial and final states of reactants
