CHEMISTRY
Feb 24, 2011
Warm Up
• Place your homework on the table
• How many moles are there in 67 L of H2 gas?
• How many moles are there in 78 g of
Mg(OH)2?
Agenda
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Warm Up
Grade Unit 8 Worksheet 1
Unit 8: Intro to Mole Part II
Quiz
Homework
– Unit 8 Worksheet 2
– Test Make Up
• Friday (Last Day)
Grade Homework
• Unit 8 Worksheet 1
Mole Conversions
• 3 Step Process (Refer to chart)
– How many atoms are in 2L of Oxygen gas?
• Where do you begin? (the given: Volume)
• What do you need in the end? (atoms)
– How many conversion factors do we need?
• Volume to moles
• Moles to atoms
2 L x 1 mole x 6.02x1023 atoms of O2 = 5.38 x 102
22.4 L
1 mole
atoms
Practice
• How many molecules are there in 98 g of
Potassium hydroxide?
• How many grams are there in 4 x 1024
molecules of Iron (II) chloride?
• How many molecules are there in 15 L of
Cl2 gas?
• What is the volume of gas (in L) in 5 x 1025
molecules of O2?
Unit 8 Quiz #1
1. How many grams are there in 4.5 moles
of sodium chloride?
2. How many moles are there in 3.25 x 1025
atoms of silver?
3. How many molecules are there in 96 g of
carbon dioxide?
4. How many grams are there in 4 x 1024
molecules of Iron (II) chloride?
Closure
• Reflect learning on Mole Calculations