If one mole of a substance is present in $1 \ kg$ of solvent,then

If $100 \ g$ of a $0.2 \ m$ aqueous solution is diluted by adding $200 \ g$ of water,what will be the molality of the resulting solution?

$A$ sample of drinking water was found to be severely contaminated with chloroform,$CHCl_{3}$,supposed to be carcinogenic in nature. The level of contamination was $15 \ ppm$ (by mass).
$(i)$ Express this in percent by mass.
$(ii)$ Determine the molality of chloroform in the water sample.

Calculate the molarity of ethanol in a solution where the mole fraction of ethanol is $0.040$. (Assume the density of water is $1 \ g/mL$.) (in $M$)

$171 \ g$ of cane sugar $(C_{12}H_{22}O_{11})$ is dissolved in $1 \ L$ of water. The molarity of the solution is ......... $M$.

What is the physical state of a solution containing camphor as the solute and $N_2$ gas as the solvent?