Mr(MgCl2) = 24 + 35,5 * 2 = 95
Mr(H2SO4) = 1*2 + 32 + 16*4 = 98
Mr(Ca(OH)2) = 40 + 16*2 + 1*2 = 74
Mr(Al2O3) = 27*2 + 16*3 = 102
Mr(H3BO3) = 1*3 + 11 + 16*3 = 62
Mr(CuSO4) = 63,5 + 32 + 16*4 = 159,5
Mr(MgCl2) = 24 + 35,5 * 2 = 95
Mr(H2SO4) = 1*2 + 32 + 16*4 = 98
Mr(Ca(OH)2) = 40 + 16*2 + 1*2 = 74
Mr(Al2O3) = 27*2 + 16*3 = 102
Mr(H3BO3) = 1*3 + 11 + 16*3 = 62
Mr(CuSO4) = 63,5 + 32 + 16*4 = 159,5