$13\mathrm{.}17)$ For the cell $(13\mathrm{.}32),$ emfs at $60C$ and $1$ bar $H_2$ pressure

as a function of $HCl$ molality $m$ are:

$($a$)$ Use a graphical method to find $E$ at $60C.($b$)$ Calculate

the $60CHCl(aq)$ mean ionic activity coefficients at $m=$

$00\mathrm{.}005mo\frac{l}{k}g$ and $0\mathrm{.}1mo\frac{l}{k}g.$