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Question
In a muscle, the extracellular and intracellular concentrations of Na+ are 150 mM and 12 mM, and those of
K+ are 2.7 mM and 140 mM, respectively. Assume that the temperature is 25oC and that the membrane
potential is -60 mV, with the interior more negatively charged than the exterior. (R = 8.314 J mol-1 K-1;
F = 96.45 kJ mol-1 V-1) The free energy change for the transport of three Na+ out of the cell is
Options:
A .  +1.5 kJ/mol
B .  +17.4 kJ/mol
C .  +18.9 kJ/mol
D .  +36.3 kJ/mol
Answer: Option D


-NA-



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