Unit 3, Lesson 6: Mole Calculations Involving Density

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Presentation transcript:

Unit 3, Lesson 6: Mole Calculations Involving Density

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)

Mole Problems Involving Density Example: The density of ethanol is 0.790 g/mL. What is the volume occupied by 3.00 mol of ethanol, CH3CH2OH(l)? 10 min

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

Brain Break!

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

Practice Time! Pg. 88 #25-34 (homework for today). Tip for Success: You can now do #35-43 on pg. 88-90. 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