# What is an atomic mass of NaOH ?

Jun 25, 2018

Well, what is the molar mass of sodium hydroxide....?

#### Explanation:

The molar mass of sodium hydroxide is $40.00 \cdot g \cdot m o {l}^{-} 1$...

But this, BY DEFINITION, specifies the mass of $\text{Avogadro's number}$ formula units of sodium hydroxide....i.e. $6.022 \times {10}^{23} \cdot \text{formula units of sodium hydroxide per mole.}$

And thus the mass of ONE formula unit of sodium hydroxide is given by the quotient....

$\text{mass"_"one formula unit of NaOH} = \frac{40.00 \cdot g \cdot m o {l}^{-} 1}{6.022 \times {10}^{23} \cdot m o {l}^{-} 1}$

$= 6.641 \times {10}^{-} 23 \cdot g$...