Question

Calculate the number of formula units of KBr in 16.4 moles6.643.67x10229.87x10241786

Answer 1

The formula units corresponds to the molecules of a substance, there is a relationship between moles and molecules, this relationship is Avogadro's number.

Avogadro's number tells us that a mole of any substance contains 6.022x10^23 molecules. Therefore in 16.4 moles of Kbr there will be:

`\begin{gathered} \text{Formula units}=\text{Given moles}*\frac{6.022*10^(23)molecules}{1\text{ mol}} \\ \text{Formula units}=16.4\text{mol}*\frac{6.022*10^(23)molecules}{1\text{ mol}}=9.87*10^(24)formulaunits \end{gathered}`

The number of formula units of Kbr in 16.4 moles is 9.87x10^24