Dilute HCl is reacted with 4.5 moles of calcium carbonate.

Calculate :

(i) The mass of 4.5 moles of CaCO₃.

(ii) The volume of CO₂ liberated at stp.

(iii) The mass of CaCl₂ formed ?

(iv) The number of moles of the acid HCl used in the reaction [relative molecular mass of CaCO₃ is 100 and of CaCl₂ is 111.]

Calculate the mass of :

(i) 10²² atoms of sulphur.

(ii) 0.1 mole of carbon dioxide.

[S = 32, C = 12 and O = 16 and Avogadro's Number 6 × 10²³]

The mass of 5.6 dm³ of a certain gas at STP is 12.0 g. Calculate the relative molecular mass of the gas.

The vapour density of a gas is 8. What would be the volume occupied by 24.0 g of the gas at STP ?