I need help, I don't know how to approach this question

Question

The free energy generated by ion movement in the cell is used by the cell to do work. Compute the minimum number of millimoles of sodium that would be needed to pump one millimole of calcium ions if the following concentrations were present in the cell. Assume the temperature to be 370C and recall that R=0.008314 kJ/mol-K.

Na^+ (aq, 11mM) ----> Na^+ (aq,9.25 mM)
Ca^2+ (aq, 5mM) ----> Ca^2+ (aq, 475mM)

Answer 1

I understand the question, vaguely, but can you clue me in on the concentrations at the end of the post. You have two mM for both. Which is right for each?

Answer 2

The two chemical equations with the concentration amounts are as listed on the problem. That's what I was trying to figure out normally I can solve if only given one set of concentrations but I don't have a clue as to what to do now that I am given a mother set

Answer 3

I don't understand the problem either.