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 . Share with your friends Share 2 Geetha answered this 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 0 View Full Answer