A solution was prepared by dissolving $5\mathrm{.}55$g of KCl $*$MgCl$2*6$H$2$O $(277\mathrm{.}85$g$/$mol$)$ in sufficient water to give $4\mathrm{.}000$L$.$ Calculate

a$.)$ the molar analytical concentration of KCl $*$MgCl$2$ in this solution.

b$.)$ The molar concentration of Mg$2+$

c$.)$ The molar concentration of Cl$-$

Please show all work and explain steps.