5) In one experiment, 12 gm of Mg combines with 8 gm of O₂ to form 20 gm of MgO. In another experiment, when 150 gm of Mg combines with 100 gm of O₂, then 250 gm of MgO is formed. These two experiments follow:

6) H combines with O to form two compounds, water and hydrogen peroxide. If 2 gm of H reacts with O completely to form 18 gm of water and 34 gm of hydrogen peroxide, then what is the ratio of mass of O combining with H?

7) The vapour density of a gas is 11.2, then 11.2 gm of this gas at NTP will occupy a volume of:

8) Calculate the number of molecules of dinitrogen oxide in 0.044 kg of the gas:

9) Calculate the number of atoms in 1 gm of neon: