# What is gram atom? 5 g atoms of Nitrogen, how much it would be? Thank you.

Nov 19, 2016

You already know how to do this; it is simply the number of atoms that have that much mass in total. Since we are considering $\text{N}$ atom and not ${\text{N}}_{2}$:

"5 g N" xx "1 mol"/"14.007 g N" xx (6.022xx10^23 "whatever you want")/("1 mol")

$= \textcolor{b l u e}{2.15 \times {10}^{23}}$ $\textcolor{b l u e}{\text{atoms of N}}$

And if you really think about it, ths number is about 1/3 of a $\text{mol}$, and $\text{5 g}$ is about 1/3 of $\text{14.007 g}$ in $\text{1 mol}$ of $\text{N}$.

If you mean the unit "gram atom", then Michael mentioned that it was an obsolete term for the "mol". So, yes, a "gram atom" (a countable quantity) is a "mol", but these days, it can be confused with a certain number of "grams" of an atom (a mass).