Calculating the Standard Entropy of Reaction, _Sorxn
Problem: Calculate the _ Sorxn for the oxidation of one mole of S8 to form either SO2 (g), or SO3 (g) at 25oC:
S8 (s) + 8 O2 (g) 8 SO2 (g)
versus
S8 (s) + 12 O2 (g) 8 SO3 (g)
Plan: To determine _ Sorxn, apply Equation 20.3. We predict the sign of _ Sorxn from the change in the number of moles of gas: 8 = 8 or 12 = 8, so the entropy will decrease (_ Sorxn< 0).
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