Question

what is law pf conservation of mass and law of constant proportions


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Answer 1

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Law Of Conservation Of Mass :

The Law of Conservation of Mass dates from Antoine Lavoisier's 1789 discovery that mass is neither created nor destroyed in chemical reactions. In other words, the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction.

Law Of Constant Proportions :

The law of constant proportions states that chemical compounds are made up of elements that are present in a fixed ratio by mass.

For example, in a nitrogen dioxide (NO2) molecule, the ratio of the number of nitrogen and oxygen atoms is 1:2 but the mass ratio is 14:32 (or 7:16).

Answer 2

Answer:

Law of conservation of mass

This law was proposed by Lavoisier. It states that matter can neither b created nor be destroyed. or in a chemical reaction the total mass of the reaction is equal to the total mass of products. Chemical equations are balanced according to this law

2H2 + O2----- 2H2O

Law of constant proportion

This law was proposed by Joseph Proust. It states that a given compound always contains exactly the same proportion of elements by weight. Irrespective of the source a given compound always contains same elements combined together in the same proportion by mass. This law is also known as law of definite proportion