Given a solution that is $0\mathrm{.}010molk{g}^{-1}$CaCl$2(aq)$ and $0\mathrm{.}030$molkg$-1$NaF$(aq)$ :

a$.$ What is the ionic strength of the solution?

b$.$ What is the activity coefficient for the solution using Debye$-$Huckle Limiting Law? $(A=0\mathrm{.}509)$

c$.$ If the $0\mathrm{.}010mo\frac{l}{k}$gCaCl$2$ solution is prepared in a separate container, what is the activity of the salt if its activity coefficient estimated from Debye$-$Huckle Limiting Law?