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

Calculate the molarity of a solution containing $5 \, g$ of $NaOH$ in $450 \, mL$ solution. (in $, M$)

When $7.1 \ g$ of $Na_2SO_4$ (molecular mass $142$) dissolves in $100 \ mL$ of $H_2O$,the molarity of the solution is $.........$ $M$.

What is meant by the concentration of a solution?

Nalorphene $(C_{19}H_{21}NO_{3})$,similar to morphine,is used to combat withdrawal symptoms in narcotic users. The dose of nalorphene generally given is $1.5 \, mg$. Calculate the mass of $1.5 \times 10^{-3} \, m$ aqueous solution required for the above dose.

The normality of $4\% \ (w/V)$ $NaOH$ is