1. Moles to Grams Calculations

2. A mole is a measurement similar to a dozen (12) EXCEPT much larger. 6
A mole is a measurement similar to a dozen (12) EXCEPT much larger X 1023 units. Now we want to find out how much several moles will weigh.

3. Quick review: What is the molar mass of 1 mole of H2O?
H2O = g/mol

4. So to determine the mass of a substance we can multiply the number of moles by the molar mass.

5. Let’s say we have 2 moles of H2O. What is the mass?
H2O = g/mol
Grams = moles X molar mass
(2 mol)(18.02 g/mol) = g

6. What is the mass of 2.5 moles of H2O?
H2O = g/mol
Grams = moles X molar mass
(2.5 mol)(18.02 g/mol) = g

7. What is the mass of 4.25 moles of CO2 ?
CO2 = g/mol
Grams = moles X molar mass
(4.25 mol)(44.01 g/mol) = g

8. Oh yeah… What is the name of CO2?
Carbon Dioxide

9. Grams = moles X molar mass (0.5 mol)(18.02 g/mol) = 9.01 g
We can also calculate a fraction of a mole the same way. What is the mass of 0.5 moles of H2O?
H = (2)(1.01) = 2.02
O = (1)(16) = 16
H2O = g/mol
Grams = moles X molar mass
(0.5 mol)(18.02 g/mol) = 9.01 g

10. What is the mass of 0.25 moles of NaCl?
NaCl = g/mol
Grams = moles X molar mass
(0.25 mol)(58.44 g/mol) = g

11. What is the mass of 0.01 moles of SnF2?
SnF2 = g/mol
Grams = moles X molar mass
(0.01 mol)( g/mol) = 1.57 g