Examples

This still leaves open the question of temperature. All of these values are determined for "standard states" (1 atmosphere pressure, 1 M concentration) and 298 K. What if the temperature is different?

This is where life becomes "interesting". Recall that when we talked about the entropy change in the surroundings it mattered whether the temperature of the surroundings was low or high. It is time to take another look at the energy/entropy picture in order to sort this out.