1. Calcium carbonate is decomposed on heating in the following reaction
CaCO₃ → CaO + CO₂
i. How many moles of Calcium carbonate are involved in this reaction?
ii. Calculate the gram molecular mass of calcium carbonate involved in this reaction.
iii. How many moles of CO₂ are there in this equation?

Calculation of molecular mass
Calculate the gram molecular mass of the following.
i) H₂O
ii) CO₂
iii) Ca₃ (PO₄)₂

Calculation of mass from mole
Calculate the mass of the following
i) 0.3 mole of aluminium (Atomic mass of Al = 27)
ii) 2.24 litre of SO₂ gas at S.T.P
iii) 1.51 × 10²³ molecules of water
iv) 5 × 10²³ molecules of glucose

Calculation based on molar volume
Calculate the volume occupied by:
i) 2.5 mole of CO₂ at S.T.P
ii) 12.046 × 10²³ of ammonia gas molecules
iii) 14 g nitrogen gas

Find the mass percentage composition of methane (CH₄).