It means that in any pure compound, the proportion of constituent elements (by mass) is a constant. This allows their chemical formulae to be determined.
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The law of constant composition for compounds is a law in chemistry according to which any given compound always contains the same component elements in the same ratios, by mass. The ratios do not depend on where the compound comes from or the way in which it was produced.
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That is the law of constant composition.
No, one example would be wüstite. Please see the link.
In case of BOYLE'S law,temperature is held constant! thank you!!