Question

The mass of an atom of hydrogen is equivalent to 1-12th the mass of a _____ atom

Answer 1

Atomic Mass unit

1. An atomic mass unit (AMU) is defined as a mass equal to the one-twelfth mass of an atom of carbon-12.
2. The mass of an isotope of any element is expressed in the carbon-12 standard.
3. It is a unit of mass used to express atomic masses and molecular masses.
4. When the mass is expressed in AMU, it roughly reflects the sum of the number of protons and neutrons in the atomic nucleus.
5. Units: $1\mathrm{u}=1\mathrm{Da}=1\mathrm{amu}=1\mathrm{g}/\mathrm{mol}$
6. A carbon 12-atom is defined as having a mass of 12u.

Therefore, the mass of an atom of hydrogen is equal to $1/12$th the mass of a carbon atom.