Question

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

Answer 1

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 `"N"` atom and not `"N"_2`:

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

`= color(blue)(2.15 xx 10^23)` `color(blue)("atoms of N")`

And if you really think about it, ths number is about 1/3 of a `"mol"`, and `"5 g"` is about 1/3 of `"14.007 g"` in `"1 mol"` of `"N"`.

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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).