Question

which law of chemical combination obeys formation of cu2o and cuo

Answer 1

Law of Multiple Proportions satisfies this formation of multiple compounds between two same elements

Answer 2

Answer: These two compounds are obeying law of multiple proportion.

Explanation:

Law of multiple proportions states that when two elements combine to form two or more compounds in more than one proportion. The mass of one element that combine with a given mass of the other element are present in the ratios of small whole number.

In the given compounds, $Cu_2O\text{ and }CuO$

Mass of Copper = 63.5 g/mol

Mass of oxygen = 16 g/mol

Ratios of mass of elements in $Cu_2O$

Mass of Copper = (2 × 63.5) = 127 g/mol

Mass of Oxygen = 16 g/mol

Mass ratio of copper and oxygen in $Cu_2O$ is 127 : 16

Ratios of mass of elements in $CuO$

Mass of Copper = 63.5 g/mol

Mass of Oxygen = 16 g/mol

Mass ratio of copper and oxygen in $CuO$ is 63.5 : 16

As, the mass of oxygen is fixed, so the mass ratio of copper in both the compounds must be in whole number ratio.

Mass ratio of copper in both the compounds =  63.5 : 127 = 1 : 2

Hence, these two compounds obeys Law of multiple proportions.