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Enthalpy (H)
The total amount of thermal energy in a substance
Enthalpy Change (ΔH)
the difference in enthalpy associated with a particular change. The change can be physical or chemical. Units are J; often given in kJ. It will tell us how much energy was absorbed or released.
formula to calculate change in enthalphy?
ΔH = n ΔHr
Molar enthalpy
The enthalpy change per mole of a substance undergoing a change • shown by the symbol ∆Hr , where r represents the type of reaction occurring
calorimeters are used to determine...? (which type of enthalphy? ie... change? sol? sys? surr?)
Calorimeters are often used to determine ∆Hsol, or the enthalpy change when a salt is dissolved in water
in a solution of salt and water... which will be our system and surroudnings?
The salt would be considered our system. • The water in the calorimeter would be considered our surroundings
