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(A) The law of multiple proportions states that when two elements combine to form more than one compound,the masses of one element that combine with a

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$CO$ and $CO_2$

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(A) The law of multiple proportions states that when two elements combine to form more than one compound,the masses of one element that combine with a fixed mass of the other are in the ratio of small whole numbers.In $CO$,$12 \ g$ of $C$ combines with $16 \ g$ of $O$.In $CO_2$,$12 \ g$ of $C$ combines with $32 \ g$ of $O$.The ratio of the masses of oxygen that combine with a fixed mass of carbon $(12 \ g)$ is $16:32$,which simplifies to $1:2$.This is a simple whole-number ratio,thus $CO$ and $CO_2$ illustrate the law of multiple proportions.

Which of the following pairs of substances illustrates the law of multiple proportions?

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