Whats the difference between enthalpy and molar heat of combustion? (1 Viewer)
- Thread starter tycho
- Start date
gigglinJess
Broken Inside
- Joined
- Oct 27, 2007
- Messages
- 106
- Gender
- Female
- HSC
- 2009
Enthalpy
Enthalpy is the heat content of a substance/group of substances.
Change in enthalpy
ΔH = heat absorbed per mole when the reaction occurs at a specific pressure
ΔH = enthalpy of products - enthalpy of reactants
Endothermic reactions : ΔH is positive
Exothermic reactions : ΔH is negative
Molar heat of combustion
The amount of heat released per unit mass or unit volume of a substance when the substance is completely burned
ΔH = -mcΔT
where m = mass of water heated
c = specific heat of water (4.18 x 10^3 J kg^-1 K^-1)
ΔT = change in temperature (final temp - intitial temp)
Hope this helps you
Enthalpy is the heat content of a substance/group of substances.
Change in enthalpy
ΔH = heat absorbed per mole when the reaction occurs at a specific pressure
ΔH = enthalpy of products - enthalpy of reactants
Endothermic reactions : ΔH is positive
Exothermic reactions : ΔH is negative
Molar heat of combustion
The amount of heat released per unit mass or unit volume of a substance when the substance is completely burned
ΔH = -mcΔT
where m = mass of water heated
c = specific heat of water (4.18 x 10^3 J kg^-1 K^-1)
ΔT = change in temperature (final temp - intitial temp)
Hope this helps you
Last edited: