Moles to Atoms

To go to atoms from moles you must use Avogrado's number (6.02 x 10^23)

1. How many atoms are in 1.5 mol of Iron:

     1.5 mol x 6.02x 10^23 atoms = 9.0 x 10^23 atoms
                           1 mol

2. How much water molecules are there in 0.65 mol?

    0.65 mol x 6.02 x 10^23 molec  = 3.9 x 10^23 molec
                            1 mol

3. How many H2, Hydrogen atoms are there? How many Oxygen atoms? In H20

   i) 3.9 x 10^23 molec x 2 atoms = 7.8 x 10^23 atoms
                                         1 molec

  ii) 3.9 x 10^23 molec x 1 atoms  = 3.9 x 10^23 atoms
                                         1 molec

4. A cylinder of Helium contains 4.6 x 10^30 atoms. How many moles of Helium?
      4.6 x 10^ 30 atoms x 1mol   = 7.6 x 10^6 mol
                                       6.02 x 10^23 atoms


How many C atoms? How many H atoms? How many O atoms? How many in total? in CH3COOH?

1. 3.0 x 10^24 molec x 2 C atoms  = 6.0 x 10^24 C atoms
                                       1 molec

2. 3.0 X10^24 molec x 4 H atoms  = 1.2 x 10^25 H atoms
                                       1 molec

3. 3.0 x 10^24 molec x 2.0 atoms = 6 x 10^24 O atoms

4. 6.0 x 10^24 + 1.2 x 10^25 + 6 x 10^24 atoms = 2.4 x 10^25 atoms