The hardness of a water sample is due to $50 \, ppm$ of $MgSO_4$. Calculate the amount of $MgSO_4$ in $mg$ present per $kg$ of water.

How many $cc$ of water should be added to $200 \ cc$ of $seminormal$ $NaOH$ solution to make it $decinormal$?

What is the mole fraction of water in a spirit sample containing $92 \%$ ethyl alcohol by weight?

Concentration terms such as mass percentage,$ppm$,mole fraction,and molality are independent of temperature,whereas molarity is a function of temperature. Explain.

The $\% \ w/V$ unit is used in which branch of science?

An aqueous solution of urea containing $18 \ g$ of urea in $1500 \ cm^{3}$ of the solution has a density of $1.052 \ g/cm^{3}$. If the molecular weight of urea is $60$,the molality of the solution is: (in $m$)