In 1961, scientists agreed that the atomic mass unit (amu)
Chapter 3, Problem 3.117(choose chapter or problem)
In 1961, scientists agreed that the atomic mass unit (amu) would be defined as the mass of an atom of 12C. Before then, it was defined as 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 Avogadros number change after the definition of an amu changed and, if so, in what direction? (b) Did the definition of the mole change? (c) Did the mass of a mole of a substance change? (d) Before 1961, was Avogadros number 6.02 10 23 (when considered to three significant figures), as it is today?
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