LECTURE PHYSICAL CHEMISTRY 3rd EDITION ROBERT G. MORTIMER

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Since the combination can undergo only adiabatic
processes,
In order to focus on the system, we rewrite Eq. (3.2-
24) in the form
It is not necessary that dS be positive. However, if dS
is negative, then dS surr must be positive and large
enough that the sum dS + dS surr is not negative. Since
we wish to focus our attention on the system, we
make the simplest possible assumption about
the surroundings. We assume that the heat capacity
and thermal conductivity of the surroundings are so
large that all processes in the surroundings can be
considered to be reversible.
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