I've never done this before.. I hope it works...
(Q)What is the exact formula of CuSO4-XH20? Show all the steps that you used to determine the value of X. Remember that X must be a positive interger.
So it was this lab where we had an unknown substance... CuSO4-*X*H20.. and we had to find the value of x.
CuS04-XH20(s)--> XH2O(l) + CuSO4(s) That is the formula
The initial amount of CuSO4-XH20 is 1.59g
The mass of CUSO4 is 1.02g
Hope that makes sense:S