Presentation on theme: "Chapter 12: Stoichiometry"— Presentation transcript:
1 Chapter 12: Stoichiometry Mr. SamaniegoLawndale High
2 Problem 12.2 (moles of product) How many moles of ammonia are produced when mol of nitrogen reacts with hydrogen?mol = ? (NH3)0.60 mol N2N H NH3320.60 mol N2= 1.2 mol NH3
3 12.1 The Arithmetic of Equations Balanced equations are necessary to find the amount of product or reactant needed in a chemical reaction.Cu + O2 CuO
4 Problem 12.3 (mass of product) Calculate the number of grams of NH3 produced by the reaction of 5.40 g of hydrogen with an excess of nitrogen. The balanced equation isN H NH332mass = ? (NH3)5.40 g H25.40 g H2= 30.4 g NH3
5 Example Problem (p. 379, 44) Li3N + 3H2O NH3 + 3LiOH Lithium nitride reacts with water to form ammonia and aqueous lithium hydroxide.Li3N + 3H2O NH3 + 3LiOHa. What mass of water is needed to react with 32.9 g of Li3N?b. When the above reaction takes place, how many molecules of NH3 are produced?c. Calculate the number of grams of Li3N that must be added to an excess of water to produce 15.0 L of NH3 (at STP).
6 Class workPages : (skip 11a). (12/14/11, 12/15/11)
7 Generic Solutions A + B C grams of A to grams of C: grams A mol A mol C grams Cmol of A to grams of C:mol A mol C grams Cmol of A to mol of C:mol A mol Cgrams of A to mol of C:grams A mol A mol C
8 Problem 36 b (mass of product) Calculate the number of grams of H2O produced by the reaction of 12.5 g of nitrogen monoxide with an excess of ammonia. The balanced equation is4NH3 + 6NO N2 + 6H2Omass = ? (H2O)12.5 g NH312.5 g NH3= 19.8 g H2O
9 Problem 12.4 (molecules of product) After Ch 12 QuizHow many molecules of oxygen are produced when g of water is decomposed by electrolysis according to this balanced equation?2H2O H O2molecules = ? (O2)29.2 g H2O29.2 g H2O= 4.88x1023 molecules O2
10 Problem 12.5 (vol-vol stoichiometry) Nitrogen monoxide and oxygen gas combine to form the brown gas nitrogen dioxide, which contributes to photochemical smog. How many liters of nitrogen dioxide are produced when 34 L of oxygen reacts with an excess of nitrogen monoxide? STP.)vol O2 = 34 Lvol = ? (NO2)2NO + O NO234 L O2Remember:1 mol = 22.4 L@STP= 68 L NO2
11 Problem 12.6 (vol stoichiometry) Assuming STP, how many milliliters of oxygen are needed to produce 20.4 mL SO3 according to this balanced equation?2SO2 + O SO3vol SO3 = 20.4 mLvol = ? (mL O2)Remember:1 mol = 22.4 L@STP20.4 mL SO3= 10.2 mL O2
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