Calculate the molecular mass of the following :

(i) Na₂SO₄.10H₂O

(ii) (NH₄)₂CO₃

(iii) (NH₂)₂CO

(iv) Mg₃N₂

Given atomic mass of Na = 23, H = 1, O = 16, C = 12, N = 14, Mg = 24, S = 32

Calculate the relative molecular masses of

(a) CHCl₃

(b) (NH₄)₂Cr₂O₇

(c) CuSO₄.5H₂O

(d) (NH₄)₂SO₄

(e) CH₃COONa

(f) Potassium chlorate, KClO₃

(g) Ammonium chloroplatinate, (NH₄)₂PtCl₆

[At. mass : C = 12, H = 1, O = 16, Cl = 35.5, N = 14, Cu = 63.5, S = 32, Na = 23, K = 39, Pt = 195, Ca = 40, P = 31, Mg = 24, Cr = 52]

Calculate the percentage of phosphorus in:

(a) Calcium hydrogen phosphate, Ca(H₂PO₄)₂

(b) Calcium phosphate, Ca₃(PO₄)₂

Calculate the percentage composition of each element in Potassium chlorate, KClO₃.