Stoichiometry Jeopardy Percent Yield Mass-Mass Mass-Volume Limiting Reactants “Stoiched” About Chemistry Q $100 Q $100 Q $100 Q $100 Q $100 Q $200 Q $200 Q $200 Q $200 Q $200 Q $300 Q $300 Q $300 Q $300 Q $300 Q $400 Q $400 Q $400 Q $400 Q $400 Q $500 Q $500 Q $500 Q $500 Q $500 Final Jeopardy

Mg + HCl -------> MgCI2 + H2 $100 Mass-Mass If 20.0 g of magnesium react with excess hydrochloric acid, how many grams of magnesium chloride will be produced? Mg + HCl -------> MgCI2 + H2

$100 Answer from Mass-Mass 39.2g MgCl2

Al + Fe2O3 ------> Fe + Al2O3 $200 Mass-Mass How many grams of aluminum would be required to produce 550 g of Fe using the following reaction? Al + Fe2O3 ------> Fe + Al2O3

$200 Answer from Mass-Mass 265.1g Al

$300 Mass-Mass What mass of oxygen is needed to completely react with 84.9 g of Fe according to the following reaction? Fe + O2 ----> Fe2O

$300 Answer from Mass-Mass 12.2g O2

$400 Mass-Mass Sodium oxide reacts with water to produce sodium hydroxide. What mass of sodium oxide must be used to produce 275 grams of sodium hydroxide?

$400 Answer from Mass Mass 212.9g Na2O

$500 Mass Mass When butane, C4H10 burns in oxygen, the products are carbon dioxide and water. What mass of carbon dioxide will be produced when 4.42 g of butane is burned in excess oxygen?

$500 Answer from Mass Mass 13.35g CO2

$100 Mass-Volume In the following equation, what volume of hydrogen gas is produced when 135 grams of aluminum are completely reacted with excess sulfuric acid?     2 Al    +  3  H2SO4 ----------->    3 H2      +    Al2(SO4)3

$100 Answer from Mass-Volume 168.6 L H2

$200 Question from Mass-Volume In the  reaction below, how many liters of   ammonia gas are produced when 35 grams of liquid nitrogen completely react with excess hydrogen?         N 2       +       3H2         ---------->        2 NH3

$200 Answer from Mass-Volume 56.0 L NH3

$300 Question from Mass-Volume What volume of oxygen is produced in the decomposition reaction of 145.73 g sodium chlorate ? NaClO3  NaCl + O2

$300 Answer from Mass-Volume 15.3 L O2

$400 Question from Mass-Volume How many grams of Al2O3 will be formed from 17.4 liters of O2? Al + O2  Al2O3

$400 Answer from Mass-Volume 58.2 g Al2O3

$500 Question from Mass-Volume How many liters of carbon dioxide will form from the combustion 320.0 grams of C5H12 with excess oxygen?

$500 Answer from Mass-Volume 497.8 L CO2

$100 Question from % Yield   Calculate the theoretical yield of Calcium Oxide if 24.8 grams of Calcium Carbonate decomposes. Calculate the percent yield if you got 13.1 grams in the laboratory. CaCO3 → CaO + CO2

$100 Answer from % Yield 94%

$200 Question from % Yield   What is the percent yield if you experimentally produce 3.65 grams of copper when 1.87 grams of Aluminum reacts with 9.65 grams of Copper (II) Sulfate? Al + CuSO4 → Cu + Al2(SO4)3

$200 Answer from % Yield 95%

$300 Question from % Yield   There are 100.0 grams of each reactant available. Determine the limiting reactant in this equation. SO2 + 2NaOH → Na2SO3 + H2O

$300 Answer from % Yield LR=NaOH

$400 Question from % Yield   Find the theoretical yield of silicon carbide if 50.0 grams of silicon dioxide reacts with 79.1 grams of Carbon.  SiO2 + C → SiC + CO

$400 Answer from % Yield 33.3g SiC

$500 Question from % Yield   What is the percent yield if 155 grams of calcium carbonate is treated with 250 grams of hydrochloric acid and 142 grams of calcium chloride is obtained? CaCO3 + HCl → CaCl2 + CO2 + H2O

$500 Answer from % Yield 56.6%

$100 Question from Limiting Reactants If 10.4 moles of hydrogen, H2, and 9.1 moles of oxygen, O2, are placed together in a container and allowed to react according to the equation. How many moles of water, H2O, would be produced by the reaction? 2 H2 + O2  2 H2O

$100 Answer from Limiting Reactants 10.4 mol H2O

$200 Question from Limiting Reactants If 83.7 grams of aluminum, Al, and 195.2 grams of sulfur, S, are put into a container and allowed to react according to the above equation, which substance(s) and how many grams of each would be present in the container after the reaction is complete? 2 Al + 3 S  Al2S3

$200 Answer from Limiting Reactants LR= Al

$300 Question from Limiting reacatants If 609.5 grams of vanadium (II) oxide, VO, and 832 grams of iron (III) oxide, Fe2O3, are put into a container and allowed to react according to the equation above, which substance(s) and how many grams of FeO would be present in the container after the reaction is complete? 2 VO + 3 Fe2O3  6 FeO + V2O5

$300 Answer from Limiting Reactants 748.6g FeO

$400 Question from Limiting Reactants Methyl alcohol (wood alcohol), CH3OH, is produced via the reaction CO(g) + 2 H2(g)  CH3OH(l) A mixture of 1.20 g H2(g) and 7.45 g CO(g) are allowed to react. Which reagent is the limiting reagent?

$400 Answer from Limiting Reactants 8.5g CH3OH

$500 Question from Limiting Reactants A welder has 20.0 moles of acetylene gas (C2H2) and 10.0 moles of oxygen gas (O2). They combine to form water and carbon dioxide. Identify the limiting reactant. How many moles of carbon dioxide gas (CO2) will form?

$500 Answer from Limiting Reactants O2 yields 8.0 mol CO2 C2H2 yields 40.0 mol CO2 O2 is the limiting reactant

$100 Question from “Stoiched” About Chemistry 0.300 moles of bromine gas (Br2) and 0.500 moles of chlorine gas (Cl2) react to form tribromochlorine (Br3Cl). How many moles of this product will form?

$100 Answer from “Stoiched” About Chemistry 0.2 mol Br3Cl

$200 Question from “Stoiched” About Chemistry Determine the % yield when 7.80 grams of benzene (C6H6) burns in oxygen gas to form 3.00 grams of CO2 gas and water vapor.

$200 Answer from “Stoiched” About Chemistry 11.5%

$300 Question from “Stoiched” About Chemistry 25.3 g of magnesium reacts with 44.3 g of copper (II) nitrate to form copper and magnesium nitrate. What mass of copper will form? What mass of reactants will remain unreacted?

$300 Answer from “Stoiched” About Chemistry 16.Og Cu will form 19.3 g un-reacted reactants

$400 Question from “Stoiched” About Chemistry 2 NH3 + 2 O2  N2O + 3 H2O If 80.0 grams of O2 are reacted in the above reaction, how many grams of N2O will be produced?

$400 Answer from “Stoiched” About Chemistry 55.2g N2O

$500 Question from “Stoiched” About Chemistry Methyl alcohol (wood alcohol), CH3OH, is produced via the reaction CO(g) + 2 H2(g)  CH3OH(l) A mixture of 1.20 g H2(g) and 7.45 g CO(g) are allowed to react. Which reagent is the limiting reagent? What is the yield of CH3OH? [Assume theoretical yield ing is what is wanted here.] How much of the reagent present in excess is left over? Suppose the actual yield is 7.52 g of CH3OH. What is the % yield?

$500 Answer from “Stoiched” About Chemistry

Final Jeopardy Question Silicon nitride (Si3N4), a ceramic, is made by the direct combination of silicon and nitrogen at high temperature. How much silicon must react with excess nitrogen to prepare 125 grams of silicon nitride if the yield of the reaction is 95%?

Final Jeopardy Answer 70.1g Si