Standard enthalpy change
- Created by: candyfloss
- Created on: 10-04-13 08:16
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- Standard Enthalpy of a reaction.
- Standard set of conditions: Temperaure - 298K (25 degrees) Pressure: 1 atmosphere/ 100kPa Solutions: 1 Mol dm3
- Standard enthalpy of a reaction: It is the enthalpy change when the number of moles of reactants as specified in the balanced equation react together.
- q = mc delta T
- q is the enthalpy change in joules.
- M is the mass of substance (solution)
- C is the specific heat capacity (4.18)
- DELTA T is the temperature difference.
- You cannot measure enthalpy change directly because of:-High activation energy -slow rate of reaction and more than one reaction taking place
- Hess' law: The (total) enthalpy change for a reaction is the same whichever route is taken
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