Hess' Law

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  • Created by: Eema003
  • Created on: 12-05-16 14:04
Hess' Law
States that the enthalpy change for a chemical reaction is the same whatever route is taken from reactants to products.
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Standard Molar Enthalpy Of Formation
Is the enthalpy change when one mole of a substance is formed from it's constituent elements under standard conditions and states.
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Standard Molar Enthalpy Of Combustion
Is the enthalpy change when one mole of a substance is completely combusted in excess oxygen under standard conditions and states
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Standard Enthalpy Of a Reaction
The enthalpy change of the whole reaction.
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Standard conditons
298K, 100Kpa
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Remember!
Remember to put in state symbols when writing equations and in hess's cycle. It is also important when drawing a hess's cycle to write whether it is enthalpy of formation, combustion or reaction.
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Card 2

Front

Is the enthalpy change when one mole of a substance is formed from it's constituent elements under standard conditions and states.

Back

Standard Molar Enthalpy Of Formation

Card 3

Front

Is the enthalpy change when one mole of a substance is completely combusted in excess oxygen under standard conditions and states

Back

Preview of the back of card 3

Card 4

Front

The enthalpy change of the whole reaction.

Back

Preview of the back of card 4

Card 5

Front

298K, 100Kpa

Back

Preview of the back of card 5
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