4. Calculate the free-energy change for the transport of an uncharged species from a concentration of 5 mM outside a cell to a concentration of 150 mM inside. Assume that the temperature is \( 25^{\circ} \mathrm{C} \).
(1) \( +2.02 \mathrm{kcal} / \mathrm{mol} \)
(2) \( +0.64 \mathrm{kcal} / \mathrm{mol} \)
(3) \( -1.38 \mathrm{kcal} / \mathrm{mol} \)
(4) \( +3.40 \mathrm{kcal} / \mathrm{mol} \)