Problems on Mole concept and Percentage composition

Problems on Mole concept and Percentage composition

    a) Calculate:

i) The mass of 1 mole of Ammonia gas.

ii) The mass of 0.25 moles of Oxygen gas.

iii) The number of moles present in 1000g. of CaCO₃.

iv) The number of moles present in 3.6g. of Water.

v) The volume occupied by 4.4g of Carbon dioxide

b)      i)Calculate the percentage of water in Hydrated Copper sulphate.(CuSO₄.5H₂O)

(H-1, O-16, S-32, Cu-64)

ii) Determine the molecular formula of a compound having percentage composition

C-40%, O-53.3% and H-6.7% and molecular weight is 60.(C-12, O-16, H-1).