Answer :

NOCHILLL
 oxygen added to the copper is 3.300 grams. 

89.920 - 83.620 = 3.300 g oxygen 

which is 0.2063 moles of oxygen. 

3.300 g O x (1 mol O / 16.00 g O) = 0.20625 mol 
batolisis

The number of moles of oxygen found in copper oxide is ≈ 0.2 mole

Given that

molar mass of oxygen = 16 g/mol  

molar mass of copper oxide ≈ 79.55 g/mol

mass of oxygen = 16 grams

∴ number of moles of oxygen in CuO = mass / molar mass of copper oxide

                              = 16 g / 79.55 g/mol

                              = 0.20113 mole

Hence we can conclude that the  number of moles of oxygen found in copper oxide is ; 0.2 mole

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