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Answer:case1 :
mass of copper oxide=2.75g
mass of copper=2.196g
% of copper = 2.196*100/2.75=79.85%
CuO=100-79.85=20.15%
case2:
mass of copper oxide =2.952g
mass of copper= 2.358g
%of copper=2.358*100/2.952=79.87%
CuO=100-79.87=20.13%.
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