Chemistry: Structure and Properties (2nd Edition)
2nd Edition
ISBN: 9780134293936
Author: Nivaldo J. Tro
Publisher: PEARSON
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Chapter 9, Problem 49E
When 1 mol of a fuel burns at constant pressure, it produces 3452 kJ of heat and does 11 kJ of work. What are
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Chapter 9 Solutions
Chemistry: Structure and Properties (2nd Edition)
Ch. 9 - What is thermochemistry? Why is it important?Ch. 9 - What is energy? What is work? List some examples...Ch. 9 - Prob. 3ECh. 9 - What is the law of conservation of energy? How...Ch. 9 - A friend claims to have constructed a machine that...Ch. 9 - What is a state function? List some examples of...Ch. 9 - What is internal energy? Is internal energy a...Ch. 9 - If energy flows out of a chemical system and into...Ch. 9 - If the internal energy of the products of a...Ch. 9 - What is heat? Explain the difference between heat...
Ch. 9 - How is the change in internal energy of a system...Ch. 9 - Explain how the sum of heat and work can be a...Ch. 9 - What is heat capacity? Explain the difference...Ch. 9 - Explain how the high specific heat capacity of...Ch. 9 - If two objects, A and B, of different temperature...Ch. 9 - What is pressure-volume work? How is it...Ch. 9 - What is calorimetry? Explain the difference...Ch. 9 - What is the change in enthalpy ( H) for a...Ch. 9 - Explain the difference between an exothermic and...Ch. 9 - From a molecular viewpoint where does the energy...Ch. 9 - From a molecular viewpoint, where does the energy...Ch. 9 - Is the change in enthalpy for a reaction an...Ch. 9 - Explain how the value of H for a reaction changes...Ch. 9 - What is Hess's law? Why is it useful?Ch. 9 - What is a standard state? What is the standard...Ch. 9 - How can bond energies be used to estimate H for a...Ch. 9 - Explain the difference between exothermic and...Ch. 9 - What is the standard enthalpy of formation for a...Ch. 9 - How do you calculate Hrxn from tabulated standard...Ch. 9 - What is lattice energy? How does lattice energy...Ch. 9 - Which statement is true of the internal energy of...Ch. 9 - During an energy exchange, a chemical system...Ch. 9 - Identify each energy exchange as primarily heat or...Ch. 9 - Identify each energy exchange as primarily heat or...Ch. 9 - A system releases 622 kJ of heat and does 105 kJ...Ch. 9 - A system absorbs 196 kJ of heat, and the...Ch. 9 - The gas in a piston (defined as the system) warms...Ch. 9 - The air in an inflated balloon (defined as the...Ch. 9 - A person packs two identical coolers for a picnic,...Ch. 9 - A kilogram of aluminum metal and a kilogram of...Ch. 9 - How much heat is required to warm 1.50 L of water...Ch. 9 - How much heat is required to warm 1.50 kg of sand...Ch. 9 - Suppose that 25 g of each substance is initially...Ch. 9 - An unknown mass of each substance, initially at...Ch. 9 - How much work (in J) is required to expand the...Ch. 9 - The average human lung expands by about 0.50 L...Ch. 9 - The air within a piston equipped with a cylinder...Ch. 9 - A gas is compressed from an initial volume of 5.55...Ch. 9 - When 1 mol of a fuel burns at constant pressure,...Ch. 9 - The change in internal energy for the combustion...Ch. 9 - Is each process exothermic or endothermic?...Ch. 9 - Is each process exothermic or endothermic?...Ch. 9 - Consider the thermochemical equation for the...Ch. 9 - What mass of natural gas (CH4) must bum to emit...Ch. 9 - Nitromethane (CH3NO2) burns in air to produce...Ch. 9 - Titanium reacts with iodine to form titanium (III)...Ch. 9 - The propane fuel (C3H8) used in gas barbeques bums...Ch. 9 - Charcoal is primarily carbon. Determine the mass...Ch. 9 - We submerge a silver block, initially at 58.5 °C...Ch. 9 - We submerge a 32.5-g iron rod, initially at 22.7...Ch. 9 - We submerge a 31.1-g wafer of pure gold initially...Ch. 9 - We submerge a 2.85-g lead weight, initially at...Ch. 9 - Two substances, A and B, initially at different...Ch. 9 - A 2.74-g sample of a substance suspected of being...Ch. 9 - Exactly 1.5 g of a fuel burns under conditions of...Ch. 9 - In order to obtain the largest possible amount of...Ch. 9 - When 0.514 g of biphenyl (C12H10) undergoes...Ch. 9 - Mothballs are composed primarily of the...Ch. 9 - Zinc metal reacts with hydrochloric acid according...Ch. 9 - Instant cold packs used to ice athletic injuries...Ch. 9 - For each generic reaction, determine the value of...Ch. 9 - Consider the generic reaction: A+2BC+3DH=155kJ...Ch. 9 - Calculate Hrxn for the reaction:...Ch. 9 - Calculate Hrxn for the reaction:...Ch. 9 - Calculate Hrxn for the reaction:...Ch. 9 - Calculate Hrxn for the reaction:...Ch. 9 - Hydrogenation reactions are used to add hydrogen...Ch. 9 - Ethanol is a possible fuel. Use average bond...Ch. 9 - Hydrogen, a potential future fuel, can be produced...Ch. 9 - Hydroxyl radicals react with and eliminate many...Ch. 9 - Write an equation for the formation of each...Ch. 9 - Prob. 82ECh. 9 - S3. Hydrazine (N2H4) is a fuel used by some...Ch. 9 - Prob. 84ECh. 9 - Prob. 85ECh. 9 - Prob. 86ECh. 9 - Prob. 87ECh. 9 - Prob. 88ECh. 9 - Top fuel dragsters and funny cars burn...Ch. 9 - Prob. 90ECh. 9 - Prob. 91ECh. 9 - Rubidium iodide has a lattice energy of-617...Ch. 9 - Prob. 93ECh. 9 - Prob. 94ECh. 9 - Use the Born-Haber cycle and data from Appendix...Ch. 9 - Prob. 96ECh. 9 - The kinetic energy of a rolling billiard ball is...Ch. 9 - A100-W light bulb is placed in a cylinder equipped...Ch. 9 - Evaporating sweat cools the body because...Ch. 9 - LP gas burns according to the exothermic reaction:...Ch. 9 - Use standard enthalpies of formation to calculate...Ch. 9 - Dry ice is solid carbon dioxide. Instead of...Ch. 9 - A 25.5-g aluminum block is warmed to 65.4 °C and...Ch. 9 - We mix 50.0 mL of ethanol (density = 0.789 g/mL)...Ch. 9 - Prob. 105ECh. 9 - Prob. 106ECh. 9 - One tablespoon of peanut butter has a mass of 16...Ch. 9 - Prob. 108ECh. 9 - Prob. 109ECh. 9 - When we burn 10.00 g of phosphorus in O2 (g) to...Ch. 9 - The H for the oxidation of S in the gas phase to...Ch. 9 - The Hfo of TiI3(s) is -328 kJ/mol; and the Ho for...Ch. 9 - A copper cube measuring 1.55 cm on edge and an...Ch. 9 - A pure gold ring and pure silver ring have a total...Ch. 9 - The reaction of Fe2O3(s) with Al(s) to form...Ch. 9 - Prob. 116ECh. 9 - Prob. 117ECh. 9 - Prob. 118ECh. 9 - Prob. 119ECh. 9 - Calculate the heat of atomization (see previous...Ch. 9 - Prob. 121ECh. 9 - Prob. 122ECh. 9 - Prob. 123ECh. 9 - Prob. 124ECh. 9 - Prob. 125ECh. 9 - Find H, E, q, and w for the freezing of water at...Ch. 9 - The heat of vaporization of water at 373 K is 40.7...Ch. 9 - Prob. 128ECh. 9 - Prob. 129ECh. 9 - Prob. 130ECh. 9 - Prob. 131ECh. 9 - Prob. 132ECh. 9 - Prob. 133ECh. 9 - Which expression describes the heat emitted in a...Ch. 9 - Prob. 135ECh. 9 - Prob. 136ECh. 9 - Prob. 137ECh. 9 - Prob. 138ECh. 9 - Prob. 139ECh. 9 - Which statement is true of a reaction in which V...Ch. 9 - Which statement is true of an endothermic...Ch. 9 - When a firecracker explodes, energy is obviously...Ch. 9 - Prob. 143ECh. 9 - Classify each process as endothermic or...Ch. 9 - A propane tank on a home barbeque contains 10.4 x...Ch. 9 - Prob. 146ECh. 9 - Consider the decomposition of liquid hydrogen...Ch. 9 - Prob. 148ECh. 9 - A chemical system produces 155 kJ of heat and does...Ch. 9 - Which sample is most likely to undergo the...Ch. 9 - Prob. 3SAQCh. 9 - A 12.5-g sample of granite initially at 82.0 C is...Ch. 9 - A cylinder with a moving piston expands from an...Ch. 9 - When a 3.80-g sample of liquid octane (C8H18)...Ch. 9 - Hydrogen gas reacts with oxygen to form water....Ch. 9 - Manganese reacts with hydrochloric acid to produce...Ch. 9 - Consider the reactions: A2BH1A3CH2 What is H for...Ch. 9 - Use standard enthalpies of formation to determine...Ch. 9 - Prob. 11SAQCh. 9 - Prob. 12SAQCh. 9 - Prob. 13SAQCh. 9 - Which set of compounds is arranged in order of...Ch. 9 - Prob. 15SAQ
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- What mass of acetylene, C2H2(g), must be burned to produce 3420 kJ of heat, given that its enthalpy of combustion is 1301 kJ/mol? Compare this with the answer to Exercise 5.91 and determine which substance produces more heat per gram.arrow_forwardConsider the following reaction in the vessel described in Question 57. A(g)+B(g)C(s)For this reaction, E=286 J, the piston moves up and the system absorbs 388 J of heat from its surroundings. (a) Is work done by the system? (b) How much work?arrow_forwardIn a calorimetric experiment, 6.48 g of lithium hydroxide, LiOH, was dissolved in water. The temperature of the calorimeter rose from 25.00C to 36.66C. What is H for the solution process? LiOH(s)Li(aq)+OH(aq) The heat capacity of the calorimeter and its contents is 547 J/C.arrow_forward
- The combustion of 1.00 mol liquid methyl alcohol (CH3OH) in excess oxygen is exothermic, giving 727 kJ of heat. (a) Write the thermochemical equation for this reaction. (b) Calculate the enthalpy change that accompanies the burning 10.0 g methanol. (c) Compare this with the amount of heat produced by 10.0 g octane, C8H18, a component of gasoline (see Exercise 5.41).arrow_forwardThe temperature of the cooling water as it leaves the hot engine of an automobile is 240 F. After it passes through the radiator it has a temperature of 175 F. Calculate the amount of heat transferred from the engine to the surroundings by one gallon of water with a specific heat of 4.184 J/g oC.arrow_forwardSulfur dioxide gas reacts with oxygen, O2(g), to produce SO3(g). This reaction releases 99.0 kJ of heat (at constant pressure) for each mole of sulfur dioxide that reacts. Write the thermochemical equation for the reaction of 2 mol of sulfur dioxide, and then also for the decomposition of 3 mol of sulfur trioxide gas into oxygen gas and sulfur dioxide gas. Do you need any other information to answer either question?arrow_forward
- Using the data in Appendix G, calculate the standard enthalpy change for each of the following reactions: (a) Si(s)+2F2(g)SiF4(g) (b) 2C(s)+2H2(g)+O2(g)CH3CO2H(l) (c) CH4(g)+N2(g)HCN(g)+NH3(g) ; (d) CS2(g)+3Cl2(g)CCl4(g)+S2Cl2(g)arrow_forwardConsider the following reaction in a vessel with a movable piston. R(g)+T(g)X(g)As the reaction takes place, the piston loses 1072 J of heat. The piston moves down and the surroundings do 549 J of work on the system. What is E?arrow_forwardWhen 2.50 g of methane burns in oxygen, 125 kJ of heat is produced. What is the enthalpy of combustion per mole of methane under these conditions?arrow_forward
- How much heat is absorbed by a 44.7-g piece of leadwhen its temperature increases by 65.4°C?arrow_forwardWhen solid iron burns in oxygen gas (at constant pressure) to produce Fe2O3(s), 1651 kJ of heat is released for every 4 mol of iron burned. How much heat is released when 10.3 g Fe2O3(s) is produced (at constant pressure)? What additional information would you need to calculate the heat released to produce this much Fe2O3(s) if you burned iron in ozone gas, O3(g), instead of O2(g)?arrow_forward9.31 A metal radiator is made from 26.0 kg of iron. The specific heat of iron is 0.449Jg1C1 . How much heat must be supplied to the radiator to raise its temperature from 25.0 to 5 5.0°C?arrow_forward
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