1 mol of atoms contains Avogadro's number of atoms. Avogadro's number =6.022140857(74)×10^23
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 .
