Question

In a SO2 and so3 the ratio of the weight of the oxygen that combines with the fixed weight of sulphur is
2:3 ratioillustrates the law of
constant proportion
conservation of mass
multiple proportions
reciprocal proportion

Answer 1

the ratio of masses of a molecule is the law of multiple proportion

Answer 2

Answer: The two compounds are obeying law of multiple proportions.

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.

For Example: $Cu_2O\text{ and }CuO$

In the above example, copper is in the ratio 2 : 1

We are given:

Two compound of sulfur and oxygen having chemical formulas $SO_2\text{ and }SO_3$

Oxygen atom is combining with sulfur in the ratio 2 : 3

The two compounds are obeying law of multiple proportions.