There is some data missing in the problem. The composition of the mixture and the reaction taking place need to be mentioned. The total experiment might help Moles of CaC2O4. H2O = mass/ molar mass = 1.075 g / 146.11 g/mol = 0.0074 moles Solution There is some data missing in the problem. The composition of the mixture and the reaction taking place need to be mentioned. The total experiment might help Moles of CaC2O4. H2O = mass/ molar mass = 1.075 g / 146.11 g/mol = 0.0074 moles.