Question

In an experiment, 4.90 g of copper oxide was obtained from 3.92 g of copper. In another experiment, 4.55 g of copper oxide gave, on reduction, 3.64 g of copper. Show with the help of calculations that these figures verify the law of constant proportions.

Answer 1

Law of Definite Proportion Verified

Explanation:

• Mass of copper oxide used in experiment 1 = 4.90 g

So, Mass of copper = 3.92 g

Mass % of Cu = 80

• Mass of copper oxide given out from experiment 2 = 4.65 g

Used mass of copper = 3.64 g

So, Mass % of Cu = 78.279

As we can see that in both the samples the copper percentage is approximately similar, which verifies the Law of Definite Proportion.