The law of multiple proportions states that if two elements can combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element, are in the ratio of small whole numbers.
The given data is tabulated as follows:
Consider the first two examples AB and AB2 where the mass of A is fixed and the mass of B is not. The ratio of masses of B with the fixed mass of A is 5:10 or 1:2 which is a simple whole number ratio. Here the law of multiple proportions is applicable.
In the second two examples, A2B and A2B3, the ratio of masses of B with the fixed mass of A is 5:15 or 1:3, which is also a simple whole number ratio.
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