Question

What is the total number of nitrogen atoms in 0.25 mole of NO2 gas?

Answer 1

Answer:

1  mol

of atoms contains Avogadro's number of atoms. Avogadro's number  

=  N A = 6.022140857  ( 74 ) × 10  23 .

Explanation:

So there are   1 4 × N A

nitrogen atoms in such a molar quantity of nitric oxide, approx.  1.5 × 10  23  individual nitrogen atoms. How many OXYGEN atoms in such a quantity?

Here I use  N A  as I would use any other collective number: a dozen, a score, a gross. I am perfectly free to do so, because any physical scientist knows precisely what I mean by a  mole .