The mole fraction of water in an $18 \% \, w/w$ aqueous solution of $C_6H_{12}O_6$ is .......

In a solution of $7.8 \ g$ benzene $(C_6H_6)$ and $46.0 \ g$ toluene $(C_6H_5CH_3)$,the mole fraction of benzene in this solution is:

If the mole fraction of the solute in benzene is $0.2$,then the molality of the solution will be ..............

$A$ solution of sugar is obtained by mixing $200 \ g$ of its $25 \%$ solution and $500 \ g$ of its $40 \%$ solution (both by mass). The mass percentage of the resulting sugar solution is $..........$. (Nearest integer)

The $ppm$ level of $F^{-}$ in a $500 \ g$ sample of a toothpaste containing $0.2 \ g$ $F^{-}$ is:

The density of a $1.0 \, m$ aqueous solution of glucose is $1.1 \, g/mL$. What is the molarity of the solution in $M$?