1. Today’s Do Now 1/23/15 At what temperature will a 1.0-g sample of neon gas exert a pressure of 500. torr in a 5.0-L container?

2. Today’s Game Plan Do Now10 minutes Real Talk3 minutes Gas Stoichiometry15 minutes Gas Stoich 2.030 minutes Assign Homework, Closing 2 minutes

3. By the end of this 40 minutes, I will be able to… Determine mass and volume relationships between reactants and products for reactions involving gases In other words… Stoichiometry + Gas Laws

4. Stoichiometry Review Grams of Given Moles of Given Moles of Unknown Grams of Unknown Each blue arrow represents a conversion factor

5. Stoichiometry Review 1. Circle your given 2. Circle what you are solving for 3. Determine the number of conversion factors you will use using the roadmap(each arrow represents a conversion factor)

6. PV=nRT Pressure must be in atmospheres (atm) Volume must be in liters (L) n (make sure to covert grams to moles) R is the gas constant= 0.08206 Latm/Kmol Temperature must be in Kelvin (K)

7. Gas Stoichiometry Calculate the volume of oxygen gas produced at 1.00atm and 25°C by the complete decomposition 10.5 grams of Potassium chlorate. The balanced equation for the reaction is: 2KClO 3 (s)  2KCl(s) + 3O 2 (g)

8. Today’s Game Plan Do Now10 minutes Real Talk3 minutes Gas Stoichiometry15 minutes Gas Stoich 2.030 minutes Assign Homework, Closing 2 minutes

9. Stoichiometry Review Grams of Given Moles of Given Moles of Unknown Grams of Unknown Each arrow represents a conversion factor Liters of Given @ STP Liters of Unknown @ STP

10. What is Standard Temperature and Pressure?? STP is 0°C and 1.00atm The volume of 1 mole of an ideal gas at STP= 22.4 L

11. Example #1 What volume of nitrogen at STP would be required to react with 50.0 g of hydrogen to produce ammonia? Remember: 22.4L/mol for STP22.4L/mol for STP N 2 (g) + 3 H 2 (g)  2NH 3 (g) **Remember – molar volume is the conversion factor for gases just like molar mass is the conversion factor in stoichiometry

12. Example #2 Sodium hydroxide and hydrogen gas are produced when sodium metal is added to water. What mass of sodium is necessary to produce 20.0L of hydrogen at STP? Remember: 22.4L/mol for STP22.4L/mol for STP 2Na (s) + 2H 2 O (l)  2NaOH (aq) + H 2(g) **Remember – molar volume is the conversion factor for gases just like molar mass is the conversion factor in stoichiometry

13. You Try… What volume of sulfur dioxide is created by 12.61 g of sulfur at STP according to the following equation? S 8 (s) + 8O 2 (g)  8SO 2 (g)

14. Homework HW due Tu/W Quiz Corrections due Tu/W Review Packet due Th/F Test on Th/F Project due 2/2 or 2/3

15. Exit Ticket Calcium carbonate, CaCO 3, can be heated to produce calcium oxide (lime), an industrial chemical with a wide variety of uses. The balanced equation for the reactions follows. CaCO 3 (s)  CaO(s) + CO 2 (g) How many grams of calcium carbonate must be decomposed to produce 5.00-L of carbon dioxide gas at STP?