$\begin{array}{1 1} (a)E= E \large\frac{0.49}{n} \log \frac{1}{[M^{n+}]} \\(b) E= E \large\frac{0.059}{n} \log \frac{1}{[M^{n+}]} \\(c) E= E \large\frac{0.9}{n} \log \frac{1}{[M^{n+}]} \\(d) E= E \large\frac{0.089}{n} \log \frac{1}{[M^{n+}]} \end{array} $