Problem 2.

What is an atomic mass of NaOH ?

Solution:

An atomic mass of a molecule NaOH is equal to the sum of

1. atomic mass of Na;

2. atomic mass of O;

3. atomic mass of H.

Atomic mass of Na is 22.99 u ( unified atomic mass unit ).

Atomics mass of O is 16 u.

Atomics mass of H is 1.008 u.

Then the atomic mass of NaOH is