Question

The density of $3 M$ solution of $NaCl$ is $10 \,g \,mL -1$ Molality of the solution is _______ $\times 10^{-2} m$ (Nearest integer) Given: Molar mass of Na and $Cl$ is $23$ and $355 \,g \,mol ^{-1}$ respectively

Answer 1

The correct answer is 364

m=1000×d−M×M.W of solute 1000×M​
=1000×1−(3×58.5)1000×3​=3.64
=364×10−2