What is the total number of nitrogen atoms in 0.25 mole of #NO_2# gas?

1 Answer
Feb 21, 2016

Answer:

#1# #"mol"# of atoms contains Avogadro's number of atoms. Avogadro's number #=# #N_A# #=# #6.022140857(74)xx10^23#.

Explanation:

So there are #1/4# #xx# #N_A# nitrogen atoms in such a molar quantity of nitric oxide, approx. #1.5xx10^23# 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"#.