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

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$CO$ and $CO_2$

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(A) The law of multiple proportions states that when two elements combine with each other to form more than one compound,the masses of one element that combine with a fixed mass of the other are in a ratio of small whole numbers.In the case of $CO$ and $CO_2$,carbon $(12.01 \ g)$ combines with oxygen in the ratio of $16.00 \ g$ $(CO)$ and $32.00 \ g$ $(CO_2)$.The ratio of the masses of oxygen is $16:32$,which simplifies to $1:2$,a simple whole number ratio. Thus,$CO$ and $CO_2$ illustrate the law of multiple proportions.

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

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