# What is the atomic mass of NaOH ?

Dec 15, 2015

The molar mass of $\text{NaOH}$ is $\text{39.997 g/mol}$.

#### Explanation:

For each element in the compound, multiply its subscript times its molar mass, then add the results to get the molar mass of the compound. The molar mass of an element is its atomic weight (mean relative atomic mass) on the periodic table in g/mol.

$\text{Na} :$$\text{22.9898 g/mol}$
$\text{O} :$$\text{15.999 g/mol}$
$\text{H} :$$\text{1.00794 g/mol}$

The subscript for each element in the compound $\text{NaOH}$ is $1$.

(1xx22.9898"g/mol")xx(1xx15.999"g/mol")xx(1xx1.00794"g/mol")="39.997 g/mol"

Dec 15, 2015

39.99u

#### Explanation:

Atomic mass of Na is 22.99 u ( unified atomic mass unit ).
Atomic mass of O is 16 u.
Atomic mass of H is 1 u.

Then the molecular mass of NaOH is :22.99+16+1=39.99u