The molarity of a solution containing $15 \text{ g}$ of $\text{NaOH}$ in $900 \text{ ml}$ of solution will be . . . . . . . (in $\text{ M}$)

$25 \ g$ of a solute of molar mass $250 \ g \ mol^{-1}$ is dissolved in $100 \ mL$ of water to obtain a solution whose density is $1.25 \ g \ mL^{-1}$. The molarity and molality of the solution are respectively

The number of moles of a solute in its solution is $20$ and the total number of moles is $80$. The mole fraction of the solute is:

$A$ solution contains $1 \ mole$ of water and $4 \ mole$ of ethanol. The mole fraction of water and ethanol will be

When $1.80 \ g$ of glucose is dissolved in $90 \ g$ of $H_2O$,the mole fraction of glucose is:

In one molal solution that contains $0.5 \ mol$ of a solute,there is