postulates for modern atomic theory
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The law of conservation of total mass is a consequence of the atomic theory of matter. Since the numbers of atoms are not changed in any chemical reaction, or in other words a chemical reaction is the rearrangement of atoms to form different molecules, atoms are conserved both in number and in type whenever a chemical reaction occurs.
Dalton's second postulate was that all atoms of the same element are identical and differ from the atoms of any other element in some fundamental way. Dalton knew that one of the ways in which the atoms of one element differ from those of another is mass. If, for example, 136 atoms of hydrogen (of relative mass 1) react with 68 atoms of oxygen (of relative mass 16), one must form 68 molecules of H2O (of relative mass 18). As a consequence, the total mass of the products will always be equal to the total mass of the reactants in any chemical reaction
Answer:
Dalton's second postulate was that all atoms of the same element are identical and differ from the atoms of any other element in some fundamental way. Dalton knew that one of the ways in which the atoms of one element differ from those of another is mass. If, for example, 136 atoms of hydrogen (of relative mass 1) react with 68 atoms of oxygen (of relative mass 16), one must form 68 molecules of H2O (of relative mass 18). As a consequence, the total mass of the products will always be equal to the total mass of the reactants in any chemical reaction