Question

1. choose the best answer.

this law was proposed by joseph proust and is known as the law of constant composition.
law of reciprocal proportions
law of conservation of mass
law of multiple proportions
law of definite proportions

Explanation:

• The law of definite proportions (also known as the law of constant composition) was proposed by Joseph Proust. It states that a given chemical compound always contains its component elements in fixed ratio (by mass) and does not depend on its source and method of preparation.
• The law of reciprocal proportions is related to the combining ratios of elements in different compounds.
• The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.
• The law of multiple proportions states that when two elements combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element are in ratios of small whole numbers.

Answer:

law of definite proportions