The ratio of initial mass 0.1253 g to final mass 0.0801 g is 0.6393.
CuSO4(H2O)5 has a molecular weight of 249.68 g/mol and CuSO4 is 159.61 g/mol, a ratio of 0.6393.
5/5 stars for removing 5/5 water molecules, minus a half star for the reaction being too perfect.
