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Verified Answer :

Nirina7

this may help you.
1. Calculate molecular mass of CuSO4•5H2O

  1. Calculate molecular mass of ALL oxygen atoms in CuSO4•5H2O (which are 4 oxygen atoms in CuSO4 and 5 oxygen atoms in H2O so in total its 9 oxygen atoms, thus find molecular mass if 9 oxygen atoms)
  2. Do mathematical cross multiplication

Molecular mass of CuSO4•5H2O - 1.67×10−2moles
molecular mass of 9 oxygen atoms - X moles

so
X= 1.67×10−2moles * molecular mass of 9 oxygen atoms / Molecular mass of CuSO4•5H2

and get the answer :3

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