= Law of multiple proportions
{wiki=Law_of_multiple_proportions}
The Law of Multiple Proportions is a fundamental principle in chemistry that describes how different compounds formed by the same elements can combine in different ratios. According to this law, when two elements can form more than one compound, the ratios of the masses of one element that combine with a fixed mass of the other element will be in simple whole-number ratios. For example, consider the elements carbon and oxygen, which can form carbon monoxide (CO) and carbon dioxide (CO₂).
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