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12. 1g mixtur...

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12. 1g mixture of cuprous oxide and cupric oxide was quantitatively reduced to 0.839g of metallic copper.What was the weight of cupric oxide in the original sample?(Cu=63.5,O=16)

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Q. 1.375 g of cupric oxide was reduced by heating in a current of hydrogen and the mass of copper that remained was 1.098 g . In another experiment 1.179 g copper was dissolved in nitric acid and the resulting copper nitrate was converted into cupric oxide . The mass of cupric oxide formed was 1.476 g . Show that these results illustrate the law of constant composition.

Q. 2.75 g of cupric oxide was reduced by heating in a current of hydrogen and the weight of copper that remained was 2.196 g. Another experiment, 2.358 g 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 2.952 g. Show that these results illustrate law of constant composition.
Hint : In first case % of oygen in

C u O = 20.14

% .In second case % of oxygen in

C u O = 20.14

%

1.375

g of cupric oxide was reduced by heating in a current of hydrogen and the weight of copper obtained was

1.098

g. In another experiment,

1.179

g of copper was dissolved in nitric acid and the resulting solution was evaporated to dryness. The residue of copper nitrate when strongly heated was converted into

1.4476

g of cupric oxide. The result of this process show :

1.375

g of cupric oxide was reduced by heating in a current of hydrogen and the weight of copper obtained was

1.098

g. In another experiment,

1.156

g of copper was dissolved in nitric acid and the resulting solution was evaporated to dryness. The residue of copper nitrate when strongly heated was converted into

1.4476

g of cupric oxide. State the law illustrated by these chemical combinations.

Q. 1.2375 g of cupric oxide on being heated in a current of hydrogen gave 0.9322 g of the metal In another experiment 0.9369 g of pure copper was dissolved in nitric acid Excess of acid evaporated and the residue has ignited The weight of the cupric oxide left was 1.2469 g. Which law of chemical combination is shown by the above results?

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