LECTURE PHYSICAL CHEMISTRY 3rd EDITION ROBERT G. MORTIMER

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Some people say that there are two
tendencies:
(1) that of the enthalpy or energy of a system
tends to decrease
(2) that the entropy of the system tends to
increase.
In fact, there is only one fundamental
tendency, that of the entropy of the
universe to increase. We can separately
focus on the two terms in Eq. (4.1-19), but
you should remember that the lowering of
the enthalpy corresponds to an increase
in the entropy of the surroundings.
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