LECTURE PHYSICAL CHEMISTRY 3rd EDITION ROBERT G. MORTIMER

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3.2. The Mathematical Statement of the Second
Law: Entropy
The second law of thermodynamics can be stated
mathematically in a way that defines a new state
function: If the differential dS is defined by
then dS is an exact differential and S is a state
function called the entropy. We now show that dq rev /T
is an exact differential.
We need to show that for all reversible cyclic
processes in a closed system.
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