1. Calculations with Moles

2. by  by  by No. of Grams x by No. of x by Moles x by No. of No. of
formula mass
(g/mol)
x by
x by
No. of
Moles
x by
6.02 x 1023
22.4 L/mol
 by
 by
No. of
Particles
No. of
Liters

3. 3 types calculations mole-mass (grams) mole-volume (liters)
mole-number of particles (avogadro’s #)

4. Moles to Mass (and back)
for mass-mole conversions:
you must calculate the FM first

5. Mole/Mass Conversions
What is the mass of 3 moles of sugar?
formula for sugar: C6H12O6
step 1: see what mole-map says!
remember, mass is in grams!
moles x formula mass = grams

6. Conversions 180g/mole C6H12O6 step 2: find the formula mass of C6H12O6
6(12g) + 12(1g) + 6(16gl) = 180 g
this means:
180g/mole C6H12O6

7. ( ) Conversions step 3: 180g/mole C6H12O6 x 3 moles
(3 moles) g = g
mole ( )

8. Mole-mass conversions
How many moles C6H12O6 are in
270.0 grams C6H12O6?
step 1: look at mole map!
grams divided by formula mass = moles
step 2:
formula mass of C6H12O6 = 180 g/mol

9. Mole-mass conversions
How many moles C6H12O6 are in
270.0 grams C6H12O6?
step 3:
270.0 g = moles
180 g/mol

10. Mole – Volume
conversions

11. Mole-Volume Conversions
for any gas:
1 mole = 22.4 liters at STP
STP = standard temperature (0C)
and pressure (1 atm)
(see Table A)

12. Mole-Volume Conversions
What is volume occupied by 4 moles
H2(g) at STP?
step 1: Look at mole map!
volume = # moles x 22.4 L/mole

13. Mole-Volume Conversions
step 2: calculate!
4 moles x 22.4 L = Liters
mole

14. Mole-Volume Conversions
How many moles of N2 are in 33.6 L?
mole map:
take liters and divide by 22.4 L/mole

15. Mole-Volume Conversions
step 2: calculate:
33.6 Liters__ = moles
22.4 L/mole