# The atomic mass unit is equal to

1. A

$1.66×{10}^{-24}\mathrm{kg}$

2. B

$1.66×{10}^{-27}\mathrm{kg}$

3. C

$1.66×{10}^{-26}\mathrm{kg}$

4. D

$1.66×{10}^{-25}\mathrm{kg}$

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### Solution:

One atomic mass unit is equal to $1.66×{10}^{-24}\mathrm{kg}$. It is equal to 1/12th of the mass of an atom of carbon-12. It is abbreviated as amu.

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