Question

What are the two laws of chemical combination .
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Answer 1

Answer:

Law of Chemical Combination

(1) Law of Conservation of Mass

In a chemical change, total mass remains conserved. i.e. mass before the reaction is equal to mass after the reaction

H2(g)+Cl2(g)⟶2HCl

Mass before reaction=2+71=73g

Mass after reaction=2x36.5=73g

(2) Law of constant or Definite Proportions 

All Chemical compounds are found to have constant composition irrespective of their method of preparation or source.

For g. in water (H2O), hydrogen and oxygen combine in 2:1 molar ratio, this ratio remains constant whether it is tap water or river water.

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Answer 2

It states that “A chemical compound is always found to be made up of the same elements combined together in the same fixed proportion by mass”. For example, a sample of pure water from various sources or any country is always made up of only hydrogen and oxygen .

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