-measure molar entropies for substances in their standard states
-increase with increasing molar mass, increasing number of atoms in the formula, and are greater for gasses than liquids/solids

(delta) S^o =
(sigma) nS^o_products --
(sigma) nS^o_reactants

So far, weve tabulated absolute entropy values to calculate standard entropy change in a system
Surroundings are essentially a large, constant-temperature heat source
Constant temperature and pressure, entropy change of surroundings is given by: (delta)S_surr = -(delta)H_sys / T