$A$ solution is $0.25 \%$ by mass. What is the weight of solvent containing $1.25 \ g$ solute (in $g$)?

The mass of urea required to make $2.5 \ kg$ of $0.25 \ molal$ aqueous solution is (in $g$)

If equal weights of $NaCl$ and $KCl$ are dissolved in the same volume of solution,how will the molarity of the two solutions compare?

If $15 \ g$ of $NaOH$ is dissolved in water to make $250 \ mL$ of solution,find the molarity of this solution in $M$.

The molality of $648 \ g$ of pure water is ........... $m$.

The density of $3 \text{ M}$ solution of sodium chloride is $1.252 \text{ g mL}^{-1}$. The molality of the solution will be ............. $\text{m}$. (molar mass,$NaCl = 58.5 \text{ g mol}^{-1}$)