$50 {\mathrm{cm}}^3$ of hydrogen collected over water at ${17}^{\mathrm{o}}\mathrm{C}$ and $750 \mathrm{mm} \mathrm{Hg}$ pressure. Calculate the volume of dry gas at STP. The water vapour pressure at ${17}^{\mathrm{o}}\mathrm{C}$ is $14 \mathrm{mm} \mathrm{Hg}$.

A given amount of a gas $\mathrm{A}$ is confined in a chamber of constant volume. When the chamber is immersed in a bath of melting ice the pressure of gas is  $100 \mathrm{cm} \mathrm{Hg}$.

What is the temperature when the pressure is $10 \mathrm{cm} \mathrm{Hg}$?

A given amount of a gas $\mathrm{A}$ is confined in a chamber of constant volume. When the chamber is immersed in a bath of melting ice the pressure of gas is  $100 \mathrm{cm} \mathrm{Hg}$.

What will be the pressure when the chamber is brought to ${100}^{\mathrm{o}}\mathrm{C}$?

$22.4$ litres of gas weighs $70 \mathrm{g}$ at STP. Calculate the weight of the gas if it occupies volume of $20$ litre at ${27}^{\mathrm{o}}\mathrm{C}$ and $700 \mathrm{mm} \mathrm{Hg}$ of pressure. ($\mathrm{R}=62.363 \mathrm{mm} \mathrm{Hg} \mathrm{L} {\mathrm{mol}}^{-1} {\mathrm{K}}^{-1}$)