# What is 1 atomic mass unit equal to?

Dec 7, 2015

$1 a . m . u . = 1.6726219 \times {10}^{- 27} k g$.

#### Explanation:

1 atomic mass unit (a.m.u.) is the mass of a proton or a neutron which is equal to $1.6726219 \times {10}^{- 27} k g$.

The mass of a Hydrogen atom is 1 a.m.u. But, also we can say that the molar mass of a hydrogen is equal to $1 \frac{g}{\text{mol}}$ and this is because:

$1.6726219 \times {10}^{- 24} g \times 6.022 \times {10}^{23} = 1.007 \text{g/mol}$

which is close to the mass that you find in a periodic table.