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Difference between Mixtures and Compounds

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According the law of definite proportion a given chemical compound always contains its component elements in fixed ratio (by mass) . But if we get the proportion in percentage and the percentage differs by one to two percent. Is it still valid

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Q. Law of constant proportion states that a chemical compound always contains the same elements combined in a fixed proportion by mass.

Q. A chemical compound always contains the elements combined in fixed proportion by mass.

Law of constant proportion states that:

In a chemical substance the elements are NOT present in a definite proportion by mass.

In a chemical compound, the elements are always present in definite proportions by mass.

Q. Law of constant proportion given by Joseph Proust that a chemical compound always consists of same element combined together in the same proportion by mass but there are some compound which are allotropic for example hydrogen and oxygen forms compound water which can be H2O or D2O that is heavy oxygen so this law should be wrong. This is same compound but with different mass

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Difference between Mixtures and Compounds

Standard VII Chemistry

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