1 atomic mass unit (amu) is defined as:

\frac{1}{16}

the mass of a oxygen-16 atom

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\frac{1}{14}

the mass of a carbon-14 atom

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\frac{1}{12}

the mass of a carbon-12 atom

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\frac{1}{12}

the mass of a carbon-14 atom

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Solution

The correct option is C $\frac{1}{12}$ the mass of a carbon-12 atom
1 amu is defined as the mass equal to one-twelveth of mass of a carbon-12 atom. It is a relative method of measuring mass of atoms using mass of carbon-12 as a standard of measurement.
$1 u = \frac{Mass of C-12 atom}{12}$

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1 atomic mass unit (amu) is defined as:

The correct option is C 112 the mass of a carbon-12 atom1 amu is defined as the mass equal to one-twelveth of mass of a carbon-12 atom. It is a relative method of measuring mass of atoms using mass of carbon-12 as a standard of measurement. 1 u=Mass of C-12 atom12

The correct option is C $\frac{1}{12}$ the mass of a carbon-12 atom
1 amu is defined as the mass equal to one-twelveth of mass of a carbon-12 atom. It is a relative method of measuring mass of atoms using mass of carbon-12 as a standard of measurement.
$1 u = \frac{Mass of C-12 atom}{12}$