In 1961, scientists agreed that the atomic mass unit (amu) would be defined as 1/12 the mass of an atom of ¹²C . Before then, it was defined as 1/16 the average mass of an atom of naturally occurring oxygen (a mixture of ¹⁶O, ¹⁷O, and ¹⁸O). The current atomic mass of oxygen is 15.9994 amu.
(a) Did Avogadro’s number change after the definition of an amu changed and, if so, in what direction?

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23-08-2022
Chemistry

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In 1961, scientists agreed that the atomic mass unit (amu) would be defined as 1/12 the mass of an atom of ¹²C . Before then, it was defined as 1/16 the average mass of an atom of naturally occurring oxygen (a mixture of ¹⁶O, ¹⁷O, and ¹⁸O). The current atomic mass of oxygen is 15.9994 amu.
(a) Did Avogadro’s number change after the definition of an amu changed and, if so, in what direction?

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tutorconsortium341 tutorconsortium341 · Answer 1 · 2022-08-29T16:40:49+02:00

There won't be a redefinition of the atomic mass unit because it was deprecated in 1961 and there is no sense in revising the definition of Avogadro’s number.

What is Avogadro’s number?

The proportionality factor that connects the quantity of material in a sample with the number of constituent particles (often molecules, atoms, or ions) in that sample is known as the Avogadro constant.
The reciprocal mole, which is its SI unit, is precisely defined as [tex]N_a = 6.02214076 \times 10^2^3 mol ^-^1[/tex]. It is named for the Italian physicist Amedeo Avogadro, albeit he was not the chemist who calculated its value.
At the Karlsruhe Congress in 1860, Stanislao Cannizzaro explained this number four years after Avogadro's passing.

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