I cannot figure out the last 4 questions on my lab. I have the rest of the data

Question

I cannot figure out the last 4 questions on my lab. I have the rest of the data filled out.

Mass of hydrated sample--1.919g

Mass of dehydrated sample--1.504g

Mass of copper--0.6950g

Moles of copper--0.01094moles

Mass of water evolved--0.4150g

Moles of water--0.02310moles

Mass of chlorine in sample (by difference)--0.5830g

Moles of chlorine--0.01642moles

Mole ratio, chlorine:copper in sample? ____:1

Mole ratio, water:copper in sample? _____:1

Formula of dehydrated sample? (round to nearest integer)

Formula of hydrated sample?

Please show work! Thank you!

Explanation / Answer

Mass of chlorine = 1.919g - 0.6950g -0.4150g

                         = 0.809g

moles of chlorine = 0.809g/35.45g/mol

                          = 0.0228 mol

mole ratio of Cl to Cu

0.0228 mol : 0.01094 mol

       2.08 : 1

           2:1

Formula of dehydrated sample = CuCl2

Mole ratio of H2O to Cu

      0.0231mol : 0.01094 mol

             2.1 : 1

              2 : 1

Formula for hydrated sample = CuCl2.2H2O

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