Chapter 8, Problem 8.73E

The mean activity coefficient for an aqueous $0.0020\text{-molal}$ solution of $\text{KCl}$ at $\text{25°C}$ is $0.951$. How well does the Debye-Huckel limiting law, equation 8.50, predicts this coefficient? As an additional exercise, calculate $\gamma$ using equations 8.52 and 8.53 [where both $\stackrel{°}{\text{a}}\left({\text{K}}^{+}\right)$ and $\stackrel{°}{\text{a}}\left({\text{Cl}}^{-}\right)=3\times {10}^{-10}\text{m}$] and ${\gamma }_{\pm }$ using equation 8.44.