Question

how many atoms in 12.3 grams of nitrogen

Answer 1

So,

We could write:

$12.3gN\ast\frac{1molN}{14gN}\ast\frac{6.022\cdot10^{23}atomsN}{1molN}$

If we calculate, we got the answer:

$=5.29\cdot10^{23}atomsN$