The solubility of a gas in water depends on the_______.
($\mathrm{i}$) nature of the gas
($\mathrm{ii}$) temperature
($\mathrm{iii}$) pressure of the gas
($\mathrm{iv}$) addition of a soluble salt

To what volume in $\mathrm{mL}$, must $50 \mathrm{mL}$ of $3.50 \mathrm{M} {\mathrm{H}}_2{\mathrm{SO}}_4$ be diluted in order to make $2 \mathrm{M}$ ${\mathrm{H}}_2{\mathrm{SO}}_4$?

Calculate the volume in $\mathrm{mL}$.

The vapour pressure of pure water at $25°\mathrm{C}$ is $23.62 \mathrm{mm}$ $\mathrm{Hg}$, What will be the vapour pressure of a solution of $1.5 \mathrm{g}$ of urea in $50 \mathrm{g}$ of water?

Give your answer up to two decimal places.