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Can make use of this tendency to work for us.
Let us know the amount of useful work to expect from
a reaction.
What is the maximum
the
amount
amount of work I can get out
of one tank of gasoline?
gasoline Thermodynamics Useful work obtained
spontaneous
through a spontaneous
combustion reaction of
gasoline Thermodynamics
Thermodynamics
A study of energy flow as well as how much
energy can be converted to useful work
Laws of Thermodynamics show that spontaneity is
is
predictable by
predictable by considering two factors:
ENTHALPY& ENTROPY
ENTROPY
H
S
Enthalpy Change (∆H) : total
energy
energy difference between
reactants & products Entropy (S) : randomness
(S)
factor accounts for energy lost
in the process Gibbs Free Energy (G) : net amount available Energy for
(G)
useful work after considering the two factors Entropy
Entropy
Entropy (S) : a measure of the randomness or disorder
randomness
of a system
order disorder S ∆S = S final  Sinitial S ∆S>0 If a change results in an increase in randomness Sinitial < Sfinal Entropy,
Entropy, S
Entropy : a thermodynamic quantity, similar to enthalpy ∆S = S final  Sinitial
• A state function:
– the change of entropy (∆S) depends
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This document was uploaded on 02/26/2014.
 Fall '14

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