Measuring Enthalpy Changes
- Created by: Jasmin
- Created on: 02-01-14 11:21
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- Measuring Enthalpy Changes
- Standard conditions
- 1 atm pressure at 298K (25 degrees C)
- Stndard enthalpy change symbol:
- expressed per mole of substance reacting and units are kJmol-1
- Standard Enthalpy change of reaction
- Enthalpy change under standard conditions
- For a reaction in the molar quantities written in the chemical equation
- Standard enthalpy change of formation
- Enthalpy change when 1 mole of the compound is formed from its elements under standard conditions
- Standard enthalpy change of formation of any element, in its standard state is therefore 0. E.g. [Cl2 (g)] = 0
- Enthalpy change when 1 mole of the compound is formed from its elements under standard conditions
- Standard enthalpy change of combustion
- Enthalpy change when 1 mole of the substance is completely burnt in oxygen under standard conditions
- Standard enthalpy change of atomization
- Enthalpy change when 1 mole of an element under standard conditions is converted to gaseous atoms
- E.g. 1/2Cl(g)--> Cl(g)
- Enthalpy change when 1 mole of an element under standard conditions is converted to gaseous atoms
- Standard Enthalpy change of neutralisation
- Enthalpy change when 1 mole of water is formed by reaction of an acid with an alkali under standard conditions
- Standard conditions
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