Moles, mass, Avogadro? How do these terms fit together?

We know the mass of a mole of any element is equal to its atomic mass in grams and that mass contains the Avogadro number of atoms.

But what about oxygen, which exists as an atom and a molecule.

Order the items below from largest to smallest size.

ITEM BANK: Move to Bottom
1 mole of oxygen
1 molecule of oxygen
1 atom of oxygen
3.01 X 1023 atoms of oxygen
4 grams of oxygen

that's what i got you can count the number of atoms

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally