ICSE Class 6 Answered

 Calculate the relative molecular masses of:

(a) Ammonium chloroplatinate, (NH₄)₂ PtCl₆

(b) Potassium chlorate (c) CuSO₄. 5H₂O (d) (NH₄)₂SO₄

(e) CH₃COONa (f) CHCl₃ (g) (NH₄)₂ Cr₂O₇

Solution 4

(a) (2N)28 + (8H)8 + (Pt)195 + (6Cl)35.5 x 6 = 444

(b) KClO₃ = (K)39 + (Cl)35.5 + (3O)48 = 122.5

(c) (Cu)63.5 + (S)32 + (4O)64 + (5H₂O)5 x 18 = 249.5

(d) (2N)28 + (8H)8 + (S)32 + (4O)64 = 132

(e) (C)12 + (3H)3 + (C)12 + (2O)32 + (Na)23 = 82

(f) (C)12 + (H)1+ (3Cl)3 x 35.5 = 119.5

(g) (2N)28 + (8H)8 + (2Cr)2 x 51.9+ (7O)7 x 16 = 252