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Question

The modern atomic mass unit is based on the mass of :
  1. C-12 isotope
  2. hydrogen
  3. oxygen
  4. nitrogen

A
nitrogen
B
C-12 isotope
C
hydrogen
D
oxygen
Solution
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One a.m.u. or one 'u' is equal to 1.660538921024 g or 1.660538921027 kg. It is equal to 112 of the mass of an atom of carbon-12.

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