(a)-Explain atomic mass unit. (b)-Define relative atomic mass of na element . (c)-explain molar mass. (d)-define mole.
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mole= it is the measure of amount of substance
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the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.
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