The density of 3 M solution of NaCl is $1.0 \mathrm{~g} \mathrm{~mL}^{-1}$. Molality of the solution is __________ $\times 10^{\prime 2} \mathrm{~m}$. . (Nearest integer). Given: Molar mass of Na and Cl is 23 and $35.5 \mathrm{~g} \mathrm{~mol}^{-1}$ respectively.
