Mr(CO2) = 12.01 + 2(16.00) = 12.01 + 32.00 = 44.01 g/mol

Mr(H3PO4) = 3(1.01) + 1(30.97) + 4(16.00) = 3.03 + 30.97 + 64.00 = 98.00 g/mol

Mr(P2O5) = 2(30.97) + 5(16.00) = 61.94 + 80.00 = 141.94 g/mol

Mr(CuSO4) = 63.55 + 1(32.07) + 4(16.00) = 63.55 + 32.07 + 64.00 = 159.62 g/mol

Mr(ZnCl2) = 65.38 + 2(35.45) = 65.38 + 70.90 = 136.28 g/mol

Mr(Al(OH)3) = 1(26.98) + 3(16.00) + 3(1.01) = 26.98 + 48.00 + 3.03 = 78.01 g/mol

Mr(Fe(OH)3) = 1(55.85) + 3(16.00) + 3(1.01) = 55.85 + 48.00 + 3.03 = 106.88 g/mol

Mr(Mg(NO3)2) = 1(24.31) + 2(14.01) + 6(16.00) = 24.31 + 28.02 + 96.00 = 148.33 g/mol

Mr(CaCO3) = 40.08 + 12.01 + 3(16.00) = 40.08 + 12.01 + 48.00 = 100.09 g/mol