an atomic mass unit is equal to a. one-half the mass of a hydrogen atom. b. one-fourth the mass of a lithium atom. c. one-twelfth the mass of a carbon-12 atom. d. one-fifteenth the mass of a nitrogen-15 atom.

Respuesta :

c - one-twelfth the mass of a carbon-12

c.  one-twelfth the mass of a carbon-12 atom.

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