Chemistry & Chemical Reactivity
9th Edition
ISBN: 9781133949640
Author: John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Videos
Textbook Question
Chapter 5, Problem 55PS
(a) Write a balanced chemical equation for the formation of 1 mol of Cr2O3(s) from Cr and O2 in their standard states. (Find the value for ΔfH° for Cr2O3(s) in Appendix L.)
(b) What is the standard enthalpy change if 2.4 g of chromium is oxidized to Cr2O3(s)?
Expert Solution & Answer
Trending nowThis is a popular solution!
Students have asked these similar questions
Boron, atomic number 5, occurs naturally as two isotopes, 10B and 11B, with natural abundances of 19.9% and 80.1%, respectively.
(a) Elemental boron reacts with fluorine to form BF3, a gas. Write a balanced chemical equation for the reaction of solid boron with fluorine gas.
(b) ΔHf° for BF3(g) is -1135.6 kj/mol. Calculate the standard enthalpy change in the reaction of boron with fluorine.
(c) Will the mass percentage of F be the same in 10BF3 and 11BF3? If not, why is that the case?
Calculate the standard enthalpy of formation of NaHCO3(s) given the following information:ΔfH°[ CO2(g) ] = −393.41 kJ mol-1, ΔfH° [ NaOH(s) ] = −425.61 kJ mol-1ΔrxnH°[NaOH(s) + CO2(g) ⟶ NaHCO3(s) ] = −127.5 kJ mol-1
Construct a diagram depicting ΔrxnH° of the above reaction and the standard enthalpies of formation of the associated products and reactants.
When 1.14 g of S is burned in the presence of O2 to give SO2, 10.3 kJ is released. From this information write the balanced equation, inserting the AH
value (in kJ per mole S) on the proper side of the equation.
Chapter 5 Solutions
Chemistry & Chemical Reactivity
Ch. 5.1 - 1. Which of the following processes is...Ch. 5.1 - 2. Your skin cools as perspiration evaporates. Is...Ch. 5.2 - You did an experiment in which you found that 59.8...Ch. 5.2 - A 15.5-g piece of chromium, heated to 100.0 C, is...Ch. 5.2 - Prob. 1RCCh. 5.2 - Prob. 2RCCh. 5.3 - Calculate the amount of energy necessary to raise...Ch. 5.3 - To make a glass of iced tea, you pour 250 mL of...Ch. 5.3 - 1. Which of the following processes requires the...Ch. 5.3 - Ice (5.0 g) at 0 C is added to 25 g of liquid...
Ch. 5.4 - Nitrogen gas (2.75 L) is confined in a cylinder...Ch. 5.4 - Which of the following processes will lead to a...Ch. 5.4 - 2. In which of the following reactions is there a...Ch. 5.5 - The combustion of ethane, C2H6, has an enthalpy...Ch. 5.5 - 1. For the reaction 2 Hg(l) + O2(g) → 2 HgO(s),...Ch. 5.5 - 2. For the reaction 2 CO(g) + O2(g) → 2 CO2(g)....Ch. 5.6 - Assume 200. mL of 0.400 M HCl is mixed with 200....Ch. 5.6 - A 1.00-g sample of ordinary table sugar (sucrose,...Ch. 5.6 - A student used a coffee-cup calorimeter to...Ch. 5.6 - If, in the experiment described in the previous...Ch. 5.7 - Use Hesss law to calculate the enthalpy change for...Ch. 5.7 - Calculate the standard enthalpy of combustion for...Ch. 5.7 - Prob. 1RCCh. 5.7 - The standard enthalpies of formation of KNO3(s)...Ch. 5.7 - Prob. 2QCh. 5.7 - The decomposition of nitroglycerin (C3H5N3O9)...Ch. 5.7 - Prob. 2RCCh. 5 - Define the terms system and surroundings. What...Ch. 5 - What determines the directionality of energy...Ch. 5 - Identify whether the following processes are...Ch. 5 - Identify whether the following processes are...Ch. 5 - The molar heat capacity of mercury is 28.1 J/mol ...Ch. 5 - The specific heat capacity of benzene (C6H6) is...Ch. 5 - The specific heat capacity of copper metal is...Ch. 5 - How much energy as heat is required to raise the...Ch. 5 - The initial temperature of a 344-g sample of iron...Ch. 5 - After absorbing 1.850 kJ of energy as heat, the...Ch. 5 - A 45.5-g sample of copper at 99.8 C is dropped...Ch. 5 - One beaker contains 156 g of water at 22 C, and a...Ch. 5 - A 182-g sample of gold at some temperature was...Ch. 5 - When 108 g of water at a temperature of 22.5 C is...Ch. 5 - A 13.8-g piece of zinc is heated to 98.8 C in...Ch. 5 - A 237-g piece of molybdenum, initially at 100.0 C,...Ch. 5 - How much energy is evolved as heat when 1.0 L of...Ch. 5 - The energy required to melt 1.00 g of ice at 0 C...Ch. 5 - How much energy is required to vaporize 125 g of...Ch. 5 - Chloromethane, CH3CI, arises from microbial...Ch. 5 - The freezing point of mercury is 38.8 C. What...Ch. 5 - What quantity of energy, in joules, is required to...Ch. 5 - Ethanol, C2HsOH, boils at 78.29 C. How much...Ch. 5 - A 25.0-mL sample of benzene at 19.9 C was cooled...Ch. 5 - As a gas cools, it is compressed from 2.50 L to...Ch. 5 - A balloon expands from 0.75 L to 1.20 L as it is...Ch. 5 - A balloon does 324 J of work on the surroundings...Ch. 5 - As the gas trapped in a cylinder with a movable...Ch. 5 - When 745 J of energy in the form of heat is...Ch. 5 - The internal energy of a gas decreases by 1.65 kJ...Ch. 5 - A volume of 1.50 L of argon gas is confined in a...Ch. 5 - Nitrogen gas is confined in a cylinder with a...Ch. 5 - Nitrogen monoxide, a gas recently found to be...Ch. 5 - Calcium carbide, CaC2, is manufactured by the...Ch. 5 - Isooctane (2,2,4-trimethylpentane), one of the...Ch. 5 - Acetic acid. CH3CO2H, is made industrially by the...Ch. 5 - You mix 125 mL of 0.250 M CsOH with 50.0 mL of...Ch. 5 - You mix 125 mL of 0.250 M CsOH with 50.0 mL of...Ch. 5 - A piece of titanium metal with a mass of 20.8 g is...Ch. 5 - A piece of chromium metal with a mass of 24.26 g...Ch. 5 - Adding 5.44 g of NH4NO3(s) to 150.0 g of water in...Ch. 5 - You should use care when dissolving H2SO4 in water...Ch. 5 - Sulfur (2.56 g) was burned in a constant-volume...Ch. 5 - Suppose you burned 0.300 g of C(s) in an excess of...Ch. 5 - Suppose you burned 1.500 g of benzoic acid,...Ch. 5 - A 0.692-g sample of glucose, C6H12O6, was burned...Ch. 5 - An ice calorimeter can be used to determine the...Ch. 5 - A 9.36-g piece of platinum was heated to 98.6 C in...Ch. 5 - The enthalpy changes for the following reactions...Ch. 5 - The enthalpy changes of the following reactions...Ch. 5 - Enthalpy changes for the following reactions can...Ch. 5 - You wish to know the enthalpy change for the...Ch. 5 - Write a balanced chemical equation for the...Ch. 5 - Write a balanced chemical equation for the...Ch. 5 - (a) Write a balanced chemical equation for the...Ch. 5 - (a) Write a balanced chemical equation for the...Ch. 5 - Use standard enthalpies of formation in Appendix L...Ch. 5 - Use standard enthalpies of formation in Appendix L...Ch. 5 - The first step in the production of nitric acid...Ch. 5 - The Romans used calcium oxide, CaO, to produce a...Ch. 5 - The standard enthalpy of formation of solid barium...Ch. 5 - An important step in the production of sulfuric...Ch. 5 - The enthalpy change for the oxidation of...Ch. 5 - The enthalpy change for the oxidation of styrene....Ch. 5 - Prob. 65GQCh. 5 - Prob. 66GQCh. 5 - For each of the following, define a system and its...Ch. 5 - Prob. 68GQCh. 5 - Use Appendix L to find the standard enthalpies of...Ch. 5 - You have a large balloon containing 1.0 mol of...Ch. 5 - Determine whether energy as heat is evolved or...Ch. 5 - Determine whether energy as heat is evolved or...Ch. 5 - Use standard enthalpies of formation to calculate...Ch. 5 - Which evolves more energy on cooling from 50 C to...Ch. 5 - You determine that 187 J of energy as heat is...Ch. 5 - Calculate the quantity of energy required to...Ch. 5 - You add 100.0 g of water at 60.0 C to 100.0 g of...Ch. 5 - Three 45-g ice cubes at 0 C are dropped into 5.00 ...Ch. 5 - Suppose that only two 45-g ice cubes had been...Ch. 5 - You take a diet cola from the refrigerator and...Ch. 5 - The standard molar enthalpy of formation of...Ch. 5 - Chloromethane, CH3Cl, a compound found throughout...Ch. 5 - Prob. 83GQCh. 5 - Camping stoves are fueled by propane (C3H8),...Ch. 5 - Prob. 85GQCh. 5 - Prob. 86GQCh. 5 - (a) Calculate the enthalpy change, rH, for the...Ch. 5 - You drink 350 mL of diet soda that is at a...Ch. 5 - Chloroform, CHCl3, is formed from methane and...Ch. 5 - Water gas, a mixture of carbon monoxide and...Ch. 5 - Using standard enthalpies of formation, verify...Ch. 5 - A piece of lead with a mass of 27.3 g was heated...Ch. 5 - A 192-g piece of copper is heated to 100.0 C in a...Ch. 5 - Insoluble AgCl(s) precipitates when solutions of...Ch. 5 - Insoluble PbBr2(s) precipitates when solutions of...Ch. 5 - The value of U for the decomposition of 7.647 g of...Ch. 5 - A bomb calorimetric experiment was run to...Ch. 5 - The meals-ready-to-eat (MREs) in the military can...Ch. 5 - On a cold day, you can warm your hands with a heat...Ch. 5 - Without doing calculations, decide whether each of...Ch. 5 - Prob. 102SCQCh. 5 - You want to determine the value for the enthalpy...Ch. 5 - Prepare a graph of specific heat capacities for...Ch. 5 - Prob. 105SCQCh. 5 - You are attending summer school and living in a...Ch. 5 - Prob. 107SCQCh. 5 - Prob. 108SCQCh. 5 - Prob. 109SCQCh. 5 - Peanuts and peanut oil are organic materials and...Ch. 5 - Isomers are molecules with the same elemental...Ch. 5 - Prob. 112SCQCh. 5 - Prob. 113SCQCh. 5 - A piece of gold (10.0 g, CAu = 0.129 J/g K) is...Ch. 5 - Methane, CH4, can be converted to methanol, which,...Ch. 5 - Calculate rH for the reaction 2 C(s) + 3 H2(g) + ...Ch. 5 - You have the six pieces of metal listed below,...Ch. 5 - Sublimation of 1.0 g of dry ice. CO2(s), forms...Ch. 5 - In the reaction of two moles of gaseous hydrogen...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.Similar questions
- Use data from Appendix J to calculate the enthalpy change and the Gibbs free energy change for the reduction of chromium(III) oxide by aluminum.arrow_forwardb) Calculate the enthalpy of formation of copper (II) sulphate from the following data: 2Cu(s) + O2(g) → 2CuO(s) AH° = -325 kJ 2S(s) + 302(g) → 2SO3(g) AH° = -800 kJ CuO(s) + SO3(g) → CuSO4(s) AH° = -220 kJarrow_forwardFor a reaction with ΔHo = 40 kJ/mol, decide which of the following statements is (are) true. Correct any false statement to make it true. (a) The reaction is exothermic; (b) ΔGo for the reaction is positive; (c) Keq is greater than 1; (d) the bonds in the starting materials are stronger than the bonds in the product; and (e) the product is favored at equilibrium.arrow_forward
- (a) Elemental boron reacts with fluorine to form BF3, a gas. Write a balanced chemical equation for the reaction of solid boron with fluorine gas. (b) ΔHf° for BF3(g) is -1135.6 kj/mol. Calculate the standard enthalpy change in the reaction of boron with fluorine.arrow_forwardHydrogen peroxide can be prepared in several ways. One method is the reaction between hydrogen and oxygen, another method is the reaction between water and oxygen. Calculate the AGxn of each reaction using values from the table of thermodynamic properties. (1) H₂(g) + O₂(g) → H₂0₂ (1) AGixn = (2) H₂O(l) + O₂(g) ⇒ H₂O₂ (1) AGixn = Which method requires less energy under standard conditions? reaction (1) reaction (2) kJ.mol-1 kJ.mol-¹arrow_forwardWhat is the enthalpy of the reaction, ΔH, for the formation of CO (g) from O2(g), oxygen, and C(s), graphite? Use the following data: O2(g) + C(s) → CO2ΔH = -393.5 kJ O2(g) +2CO (g) → 2CO2(g) ΔH = -566.0kJarrow_forward
- The thermite reaction is highly exothermic as illustrated as follows: Fe2O3 (s) + 2 Al (s) --> 2 Fe (s) + Al2O (s) + 850 kJ What mass of aluminum would be required to produce 375 kJ of energy?arrow_forwardCalculate ∆o for [Co(H2O)6]2+ in units of kJ.arrow_forwardBromine monofluoride (BrF) disproportionates to bromine gas and bromine tri- and pentafluorides. Use the following to find ΔH°rxn for the decomposition of BrF to its elements 3BrF(g) →Br₂(g)+BrF₃(l) ΔH°rxn=-125.3 kJ 5BrF(g) →2Br₂(g)+BrF₅(l) ΔH°rxn=-166.1 kJ BrF₃(l)+F₂(g) →BrF₅(l) ΔH°rxn=-158.0 kJarrow_forward
- 23. Given that the enthalpy of neutralization for the reaction of HCl (a strong acid) and NaOH (a strong base) is always -55.90 kJ per mole of H2O formed, what is the concentration of a 55 mL sample of HCl if the enthalpy of neutralization for the reaction was found to be -4.85 kJ, ΔTsoln = 4.5 ºC and the calorimeter constant value is 0.17 kJ/ºC 2.34 M 0.73 M 4.15 M 1.33 M 1.52 Marrow_forwardGiven the standard heats of formation for the following compounds, calculate the ΔH° heat of reaction, for the following reaction: Fe3O4(s) + CO(g) ---> 3 FeO(s) + CO2(g) ΔHf° for Fe3O4 = -1118 kJΔHf° for CO = -110.5 kJΔHf° for FeO = -272 kJΔHf° for CO2 = -393.5 kJarrow_forward6. (a) How much does the free energy (kJ/mole) of 15 g of pure Cu change by adding 5 g of pure Zn at a temperature of 1100 degrees C? Assume an ideal solution, and that Go(Cu) = -1200 kJ/mole, and Go(Zn) = -2000 kJ/mole at this temperature. A(Cu) = 63.55, and A(Zn) = 65.39. b) By how much more does the system free energy change by adding 5 g of Ga to the mixture in part a)? A(Ga) = 69.7, and Go(Ga) = - 3000 kJ/mole. %3Darrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Chemistry: The Molecular ScienceChemistryISBN:9781285199047Author:John W. Moore, Conrad L. StanitskiPublisher:Cengage Learning
Chemistry: Principles and PracticeChemistryISBN:9780534420123Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward MercerPublisher:Cengage Learning
Living By Chemistry: First Edition TextbookChemistryISBN:9781559539418Author:Angelica StacyPublisher:MAC HIGHER
Chemistry: The Molecular Science
Chemistry
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:Cengage Learning
Chemistry: Principles and Practice
Chemistry
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Cengage Learning
Living By Chemistry: First Edition Textbook
Chemistry
ISBN:9781559539418
Author:Angelica Stacy
Publisher:MAC HIGHER
The Laws of Thermodynamics, Entropy, and Gibbs Free Energy; Author: Professor Dave Explains;https://www.youtube.com/watch?v=8N1BxHgsoOw;License: Standard YouTube License, CC-BY