The molality of a solution,when $18 \ g$ of glucose is added to $18 \ g$ of $H_2O$,is: (in $m$)

$125 \, cm^3$ of isopropyl alcohol is added to water to make a solution of volume $175 \, cm^3$. Find the volume fraction and volume percentage of isopropyl alcohol in the solution.

$A$ solution contains $7.8 \ g$ of benzene $(C_6H_6)$ and $46.0 \ g$ of toluene $(C_6H_5CH_3)$. What is the mole fraction of benzene?

Density of $12.25\%$ (by weight) $H_2SO_4$ solution is $1.056 \ g/mL$. The molarity of the solution is .......... $M$.

If a $3.6 \, M$ solution of $H_2SO_4$ contains $29 \% \, H_2SO_4$ by mass,find the density of the $H_2SO_4$ solution. (Molar mass of $H_2SO_4 = 98 \, g \, mol^{-1}$)

Calculate the concentration of fluorine in $ppm$ in $500 \ g$ of toothpaste containing $0.2 \ g$ of fluorine.