Question

How many moles are in 756grams of Na2 CO3?

Answer 1

To convert mass to moles we will:

$\begin{gathered} moles=\frac{mass}{molar\text{ }mass} \\ \\ _nNa_2CO_3=\frac{756g}{105.99\text{ }gmol^{-1}} \\ _nNa_2CO_3=7.13mol \\ \end{gathered}$

Answer: 7.13 mol Na2CO3