Moles of Cu in the copper sulfate salt:
mass is 90. and there are 5g of copper sulfate
CuSO4...
number moles copper=numbermolesCopperSulfate
moles coppersulfate=5/90
mass is 90. and there are 5g of copper sulfate
number moles copper=numbermolesCopperSulfate
moles coppersulfate=5/90