4)State the postulates of Dalton atomic theory which explains the law of definite proortion

Asked by rohan | 6th Dec, 2013, 04:42: PM

Expert Answer:

The law of definite proportion is also known as the law of constant proportion. This law states that in a compound, the elements are always present in definite proportions by mass’.

The postulates of Dalton’s atomic theory are as follows:

  • All matter is made up of very tiny particles called atoms.
  • Atoms are indivisible. i.e, an atom cannot be divided further.
  • Atoms can neither be created nor destroyed in a chemical reaction.
  • All atoms of an element are identical in all respects, including the mass, chemical properties, etc.
  • Atoms of different elements have different masses and chemical properties.
  • Atoms of different elements combine in small whole number ratios to form compounds.
  • In a given compound, the relative number and types of atoms are constant.

So the last postulate of Dalton's theory, which states that - 'In a given compound, the relative number and types of atoms are constant' explains the law of definite proportion.

Answered by Hanisha Vyas | 9th Dec, 2013, 10:38: AM

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