Active transport is the process in which a substance is transferred from a region of lower...

Active transport is the process in which a substance is transferred from a region of lower concentration to one of higher concentration. This is a nonspontaneous process and must be coupled to a spontaneous process, such as the hydrolysis of ATP. The concentrations of K+ ions in the blood plasma and in nerve cells are 15 mM and 400 mM, respectively (1 mM = 1 X 10−3M). Use Equation 18.13 to calculate ∆G for the process at the physiological temperature of 37°C:

I n this calculation, the ∆G° term can be set to zero. What is the justification for this step?