# What is the molarity of solution, if 60g of $Co(NO_3)_2.6H_2O$ dissolved in 4.3L of solution.(m.wt=260) ?
$\begin{array}{1 1}(a)\;0.05M\\(b)\;0.1M\\(c)\;0.15M\\(d)\;0.20M\end{array}$