# Calculate the number of atoms present in 52 units of He please ?

May 31, 2017

$\text{The relative atomic mass of helium is FOUR}$.

#### Explanation:

"Relative atomic mass"="Mass of atom"/(1/12"th the mass of a """^12C" atom")

"4 atomic mass units"/("1 atomic mass unit"xx1/12)=4

And multiplication by $\text{Avogadro's number}$ gives the equivalent mass in grams........

So if you have a $52 \cdot \text{amu}$ mass of helium, you should reasonably have THIRTEEN helium atoms; unlucky for some. Agreed?