Question

1 unified atomic mass unit (1 u) is equal to the

• A. $1.66\times {10}^{-25}$ kg
• B. $1.66\times {10}^{-27}$ kg
• C. $1.66\times {10}^{-29}$ kg
• D. $1.66\times {10}^{-31}$ kg

Answer 1

Answer: (B)

$1.66\times {10}^{-27}$ kg

unified atomic mass unit (u), Dalton (Da), universal mass unit, either amu or AMU is an acceptable acronym for atomic mass unit

The "unified atomic mass unit" is a physical constant that is accepted for use in the SI measurement system. It replaces the "atomic mass unit" (without the unified part) and is the mass of one nucleon (either a proton or a neutron) of a neutral carbon-12 atom in its ground state. Technically, the amu is the unit that was based on oxygen-16 until 1961, when it was redefined based on carbon-12. Today, people use the phrase "atomic mass unit," but what they mean is "unified atomic mass unit."

One unified atomic mass unit is equal to:

$1.66yoctograms$

$1.66053904020\times {10}^{-27}kg$

$1.66053904020\times {10}^{-24}g$

$931.49409511MeV/c^2$

$1822.8839me$