Calculate the volume occupied at S.T.P. by 2 moles of SO₂.

Calculate the number of moles of CO₂ which contain 8.00 g of O₂

Calculate the weight/mass of :

(a) an atom of oxygen

(b) an atom of hydrogen

(c) a molecule of NH₃

(d) 10²² atoms of carbon

(e) the molecule of oxygen

(f) 0.25 gram atom of calcium

Calculate the mass of 0.1 mole of each of the following

(a) CaCO₃

(b) Na₂SO₄.10H₂O

(c) CaCl₂

(d) Mg

(Ca = 40, Na = 23, Mg =24, S = 32, C = 12, Cl = 35.5, O = 16, H = 1)