How much is a dozen? 12
How much is a mole? 6.02 x 10^23
If I had one dozen carbon atoms, how many carbon atoms would I have? 12
If I had two dozen carbon atoms, how many carbon atoms would I have? 24
If I had one mole carbon atoms, how many carbon atoms would I have? 6.02 x 10^23
If I had two moles of carbon atoms, how many carbon atoms would I have? 2 x 6.02 x 10^23
Avogadro's constant is 6.02 x 10^23
Just like a dozen is 12
Hope that clears it up a bit