Mr[Al2(SO4)3] = Ar[Al] * 2 + Ar[S] * 3 + Ar[O] * 12 = 26. 9815386 * 2 + 32. 065 * 3 + 15. 9994 * 12 = 342. 1508772
Mr[KMnO4] = Ar[K] + Ar[Mn] + Ar[O] * 4 = 39. 0983 + 54. 938045 + 15. 9994 * 4 = 158. 033945
Mr[Na3PO4] = Ar[Na] * 3 + Ar[P] + Ar[O] * 4 = 22. 98976928 * 3 + 30. 973762 + 15. 9994 * 4 = 163. 94066984
Mr[H2O] = Ar[H] * 2 + Ar[O] = 1. 00794 * 2 + 15. 9994 = 18. 01528
Mr[CO2] = Ar[C] + Ar[O] * 2 = 12. 0107 + 15. 9994 * 2 = 44. 0095
Mr[Ca(OH)2] = Ar[Ca] + Ar[O] * 2 + Ar[H] * 2 = 40. 078 + 15. 9994 * 2 + 1. 00794 * 2 = 74. 09268
Mr[NaCl] = Ar[Na] + Ar[Cl] = 22. 98976928 + 35. 453 = 58. 44276928
Mr[MgCl2] = Ar[Mg] + Ar[Cl] * 2 = 24. 305 + 35. 453 * 2 = 95. 211
Mr[Cl2O7] = Ar[Cl] * 2 + Ar[O] * 7 = 35. 453 * 2 + 15. 9994 * 7 = 182. 9018