Spontaneous and Entropy
Spontaneous and Entropy
Spontaneous and Entropy
Entropy changes occur whenever heat is transferred between a system and its
surroundings. The magnitude of the entropy change depends on the temperature
at which the process occurs. For a reaction taking place at constant temperature:
H orxn
S osurr
Trxn
kJ
128.2
S osurr mol
298.0 K
= 0.4300 kJ/mol-K = 4300 J/mol-K
kJ
- 178.0
S osurr mol
298.0 K
= -0.5973 kJ/mol-K = -597.3 J/mol-K
Activity: