Consider a cell membrane at 298k. the ca2 is at a concentration of 0.002 mm inside the cell and 0.4 mm outside the cell, with the voltage being 25mv higher in the interior. calculate the molar free energy difference for transporting ca2+ from the exterior to the interion a. 8.8 kj/molb. -13.6 kj/mol c. -17.9 kj/mol d. -18.4 k/mol