8: Energetics I Flashcards
Standard conditions
100KPa, 298K, 1 atm
Enthalpy change
The amount of heat energy taken in/given out during any change in a system provided the pressure is constant
Standard enthalpy change of reaction
The enthalpy change when the number of moles of reactants as specified in the balanced equation react together
Standard enthalpy change of formation
The enthalpy change when 1 mole of the compound is formed from its elements under standard conditions, with all reactants and products being in their standard state
Standard enthalpy change of combustion
The enthalpy change when one mole of substance is completely combusted in oxygen under standard conditions , with all reactants and products being in their standard states
Standard enthalpy of neutralisation
The enthalpy change when solutions of an acid and an alkali react together under standard conditions to produce 1 mole of water
Specific heat capacity equation
Q - mcΔT
Specific heat capacity of water
4.18 J/(K+g)
Common errors in measuring enthalpy change
- Incomplete combustion
- Energy lost to surroundings
Units for enthalpy change
KJ/mol
