# How many moles of He are in 16 g of the element?

May 1, 2017

$4 \text{ moles of He}$

#### Explanation:

Look at the periodic table and find the molar mass of Helium.

This tells us that $4.00$ grams of $\text{Helium}$ equates to $1 \text{ mole}$. We write it as follows:

$\textcolor{w h i t e}{a a a a a a a a a a a a a a a a a} \left(4.00 \text{g He")/(1" mole}\right)$

If we are given $16 \text{ grams}$ of $\text{He}$, then we can use what we wrote above to figure out number of $\text{moles}$ of $\text{He}$.

(16cancel"g He")/(1) * (1" mole")/(4.00cancel"g He") = 4" moles of He"

$\text{Answer": 4" moles of He}$