How many oxygen atoms are there in a #32*g# mass of oxygen gas?

1 Answer
Nov 23, 2016

Answer:

There are #2xxN_A# oxygen atoms in a #32*g# mass of dioxygen.

Explanation:

And #N_A# #=# #"Avogadro's number"# #=# #6.022xx10^23*mol^-1#

Note that #N_A# oxygen atoms have a mass of #16.0*g#.

But #N_A# oxygen MOLECULES, i.e. dioxygen, have a mass of #32.0*g#.