Question

23. Define the terms - a) Relative atomic mass b] Relative molecular mass. State why
indirect methods
are utilised to determine the absolute mass of an atom. Explain in brief the indirect method used.
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Answer 1

a)the ratio of the average mass of one atom of an element to one twelfth of the mass of an atom of carbon-12.

b)given in attachment

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Answer 2

Answer:

Relative atomic mass - the ratio of the average mass of one atom of an element to one-twelfth of the mass of an atom of carbon-12.

Relative Molecular Mass - the ratio of the average mass of one molecule of an element or compound to one-twelfth of the mass of an atom of carbon-12.

An indirect method is used to determine the absolute mass of an atom that has been devised. The mass of a particular atom is taken as a standard unit and the masses of other atoms are related to this standard.