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(C) 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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$CO, CO_2$

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(C) 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 the pair $CO$ and $CO_2$,carbon $(C)$ and oxygen $(O)$ combine to form two different compounds.In $CO$,$12 \ g$ of carbon combines with $16 \ g$ of oxygen.In $CO_2$,$12 \ g$ of carbon combines with $32 \ g$ of oxygen.The ratio of the masses of oxygen that combine with a fixed mass of carbon $(12 \ g)$ is $16:32$,which simplifies to $1:2$,a simple whole number ratio.Therefore,$CO$ and $CO_2$ demonstrate the law of multiple proportions.

Which of the following pairs of compounds demonstrates the law of multiple proportions?

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