M CuO = 64 u + 16 u = 80 u
M Fe₂O₃ = 2 * 56 u + 3 * 16 u = 160 u
M Na₂CO₃ = 2 * 23 u + 12 u + 3 * 16 u = 106 u
M H₂SO₄ = 2 * 1 u + 32 u + 4 * 16 u = 98 u
M Ca(OH)₂ = 40 u + 2 * 16 u + 2 * 1 u = 74 u
M Al₂(SO₃)₃ = 2 * 27 u + 3 * 32 u + 9 * 16 u = 294 u