Concentration of Copper???

Question

Calculate the concentration of copper in parts per million in a solution of 1.001g of the salt CUSO4.5H20, made up to 1dm3 with deionised water

Answer 1

1.001 g CUSO4.5H20 @ 63.546 g Cu / 249.7 g/mol CUSO4.5H20 = 0.2547 grams of copper

0.2547 grams Cu / dm3 = 0.2547 grams Cu / Litre

0.2547 grams Cu / Litre = 254.7 milligrams Cu / litre

254.7 milligrams Cu / litre = 254.7 ppm

your answer is 254.7 ppm

because one liter of water weighs 1 Kg ... or 1000 grams,...or 1,000,000 milligrams

so 254.7 mg Cu / 1,000,000 mg water = 254.7 ppm