2.75 g of cupric oxide was reduced by heating in a current of hydrogen and the weight of copper that remained was 2.196g. Another experiment 2.358g of copper was dissolved in nitric acid and the resulting copper nitrate converted into cupric oxide by ignition. The weight of cupric oxide formed was 2.952g. Show that these results illustrate law of constant composition?
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Answer: 20.13%.
Explanation:
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%.
The law of definite proportions, commonly referred to as the law of constant composition in chemistry, holds that pure compound samples always contain the same components in the same mass proportion.
Stoichiometry in chemistry is based on this concept and the law of multiple proportions.
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