. In a chemical substance the elements are always present in fixed proportions by mass. This is known as the_____________
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Law of Constant Proportion states that a chemical compound always contains exactly the same proportion of elements by mass. This law is also known as Law of definite proportions. Joseph Louis Proust gave this law hence, this law is also known as Prousts Law.
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In a chemical substance the elements are always present in fixed proportions by mass. This is known as Proust's law or law of constant composition.
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