PPT Slide

31

• The energy released in a bomb calorimeter cannot do PV work because the volume is constant and so P_V = 0.

• The energy change measured by a bomb calorimeter is the heat at  constant volume (q V ),which equals _E, not _H:

Stoichiometry of Thermochemical Equations

• Thermochemical equations are balanced equations that also state  the heat of reaction for the amounts of substances specified.

• _H rxn has 2 parts- a sign showing the direction of the change and  a magnitude that depends on the amount of reacting substances:

Concept 6-11. relation between DHƒrxn and amount of substance.

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