1. Unit 3, Lesson 6: Mole Calculations Involving Density

2. The Mole Is the Heart of Chemistry
molar mass
number of particles NA
mole
mass (g)
density
volume of a solid or pure liquid (mL)
molar volume
volume of a gas (L)

3. Mole Problems Involving Density
Example: The density of ethanol is g/mL. What is the volume occupied by 3.00 mol of ethanol, CH3CH2OH(l)?
10 min

4. Your Turn!
The density of Hg(l) is 13.6 g/mL. How many moles of Hg(l) are contained in 100 mL of Hg(l)?
Al2O3(s) has a density of 3.97 g/mL. How many atoms of Al are in 100 mL of Al2O3?
15 min

5. Brain Break!

6. A little bit trickier... What is the density of O2(g) at STP?
A 2.50 L bulb contains 4.91 g of a gas at STP. What is the molar mass of the gas?
15 min

7. Practice Time! Pg. 88 #25-34 (homework for today).
Tip for Success: You can now do #35-43 on pg This is not homework for today, but these are good questions to prepare you for the unit test. I would strongly suggest doing about five questions a day to keep up your skills from now until the end of the unit.
10 min