Blue crystals of copper(II) sulphate have the formula: Cu(SO4)·5H2O. What is the percentage by mass of water in
this substance? The answer I got was 1.773%

Question

Blue crystals of copper(II) sulphate have the formula: Cu(SO4)·5H2O. What is the percentage by mass of water in
this substance?  The answer I got was 1.773%

zale101 · Answer

Know the molar mass of Cu(SO4) 5H2O. Use the molar mass of water (5H20) and divide by the molar mass of Cu(SO4) 5H2O then times the result by a hundred. Did you do that?

anonymous · Answer

I did.

anonymous · Answer

But a question, When finding the molar of 5H20 would the calculation be like 10(H)+5(O) ? Like, is the 5 multiplying into the H and the O?

anonymous · Answer

36.04%

anonymous · Answer

@Yondaime

zale101 · Answer

@Yondaime that's how you do it.