Define the term 'atomic weight'.

The gas law which relates the volume of a gas to the number of molecules of the gas is :

1. Avogadro's Law
2. Gay-Lussac's Law
3. Boyle's Law
4. Charles' Law

A vessel contains X number of molecules of H₂ gas at a certain temperature & pressure. Under the same conditions of temperature & pressure, how many molecules of N₂ gas would be present in the same vessel.

A gas cylinder can hold 1 kg. of H₂ at room temp. & press. :

(i) Find the number of moles of hydrogen present.

(ii) What weight of CO₂ can the cylinder hold under similar conditions to temp. & press.

(iii) If the number of molecules of hydrogen in the cylinder is X, calculate the number of CO₂ molecules in the cylinder under the same conditions of temp. & press.

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

[H = 1, C = 12, O = 16]