CuSO4.xH2O

Question

Determine the percent by mass of water in your sample of hydrated copper (II) sulfate. Show your calculations clearly.

My work.
i got 10% is that correct

Answer 1

In one word, no.
You can calculate what you should get in the lab if you're doing a lab experiment.
molar mass CuSO4.5H2O = 249.7
molar mass 5H2O = about 90
Then (90/249.7)*100 = ?

Answer 2

Your answer fully depend on what amount of sample you take because in different samples the % by mass of water vary.

Answer 3

i got 13%