How many moles of oxygen atoms are contained in the following?
1.67 x 10-2mol cuso4-5 h₂o

This may help you.
1. Calculate molecular mass of CuSO4•5H2O 2. 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) 3. 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

I’m guessing you’re more alert to yourself or your surroundings if you’re more concentrated