5 6 gm of pure copper oxide on complete reduction by heating in a current of hydrogen gave 4 04gm - Chemistry - Some Basic Concepts of Chemistry

Question

5 6 gm of pure copper oxide on complete reduction by heating in a
current of hydrogen gave 4 04gm of metallic copper 1 3 gm of pure
metallic copper was completely dissolved in HNO3 and the
resultant solution was carefully dried and ignited 1 63 gm of
copper oxide was produced Show that it illustrates law of constant
proportions

Geetha · Accepted Answer

Law of constant proportion means whatever be the method of preparation of a compoundthe compoisition remains the same
I methodWeight of copper oxide = 5
6 gWeight of copper   = 4
04 g5
6 g of the copper oxide contained 4
04 g of the metal100 g of the  copper oxide contained = 4
045 6 × 100 = 72 14 %II method1
63 g of copper oxide contains 1
3 g of copper100 g of the  copper oxide contained = 1
31 63 × 100 = 79
75 %For the law of constant proportion, the % obtained should be same in both the methodsPlease verify your values, may be the first weight 5
6 gm of pure copper oxide is 5
06  Please verify