Question

(ii) A gas cylinder can hold $1\text{kg}$ of hydrogen at room temperature and pressure.

(d) State the law that helped you to arrive at the above result.

Answer 1

Avogadro's Law helped in arriving at the conclusion that "both hydrogen $\left({\mathrm{H}}_2\right)$ and carbon dioxide $\left({\mathrm{CO}}_2\right)$ will have equal number of molecules."

• As per this law, equal volumes of all gases involve the same number of molecules at the same pressure and temperature.
• The number of molecules of hydrogen in the cylinder is $\text{X}$.
• Both hydrogen and carbon dioxide $\left({\mathrm{CO}}_2\right)$ are present in the cylinder at same pressure and temperature.
• Since, both gases have equal volumes, therefore, both will have equal number of molecules that is $\text{X}$.