Calculate the extracellular concentration of K+in frog muscle when the intracellular concentration is 124mM. Assume a membrane potential of 100mV at 20C. Use 2 significant figures. [K+]out=M (Tolerance is +/2% ) Calculate the free energy changes at 20C for the transmembrane movement of Na+and K+ions using the conditions presented in Figure 9.1. Assume the membrane potential is 70mV. Use 3 significant figures. G(Na+)=G(K+)=kJmol1kJmol1 (Tolerance is +/2% )