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?

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Presentation transcript:

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?

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

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

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

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)

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= Latm/Kmol Temperature must be in Kelvin (K)

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)

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

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

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

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

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

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

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

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?