Question

On heating 632kg of cu in air, 7.92kg of copper oxide is formed. Another sample of copper oxide contains 80% of copper. From these data,show that the law of definite proportion is valid.

Answer 1

Answer:

Explanation:

Given On heating 6.32 kg of cu in air, 7.92 kg of copper oxide is formed. Another sample of copper oxide contains 80% of copper. From these data, show that the law of definite proportion is valid.

Now given mass of copper is 6.32 kg  

Mass of CuO = 7.92 kg  

Now percentage composition of Copper = Mass of copper / mass of copper oxide x 100  

So we get = 6.32/7.92 x 100

                = 0.79% ≅ 80%

Law of definite proportion states that the given compound contains its component elements in a fixed ratio by mass.

So here the law of proportion is valid.