1. Chemistry I
Mole Review

2. What is a Mole? 1 mole = 6.02 x 1023 particles = molar mass = 22.4 L
Mole = amount of substance that contains as many atoms/molecules/particles as there are atoms in exactly 12 g of carbon-12 isotope!
Avogadro’s number = 6.02 x 1023

3. Molar Mass Mass of 1 mole of units (atoms or molecules)
Number from the periodic table:
Na: 22.9
C12H22O12: 358 g
Fe2(SO4)3: g
CuSO4·5 H2O: mass + 5(mass)
CuSO4: g H2O: 18 g
159.7g + 5(18) = g

4. Practice How many moles of methane (CH4) are in 6.07 g of methane?

5. Practice
How many grams of Zn are in mol of Zn?
23.3 g

6. Example
How many molecules are in 0.65 mol of SO2?

7. Example
How many atoms are in 16.3 g of sulfur?
3.06 E 23 atoms

8. Example
What is the mass of 1 atom of Sn?

9. Example
How many H grams are in 25.6 mol of urea [(NH2)2CO]? The molar mass is g.
1. Convert from moles to grams of urea.
25.6 mol x (60 g / 1 mol) = 1536 g urea
2. Find ratio of H: urea using molar mass
4 : = 0.46 mol H
3. Convert from grams of urea to grams of hydrogen.
0.46 mol x (1536 g / 1 mol) = g