Explanation Given: Change in temperature (ΔT) =10°C = 283 K Dimensions (volume) of the house = 30.0m×30.0m×3.0m=2700m 3 Specific heat capacity of air, cair = 30 J/K-mol Formula: 1. Enthalpy of combustion: ΔH non =Σn products ΔH 0 f(products) -Σn reants ΔH 0 f(reachants) ---(1) n products and n reachants the number of moles of products and reactants respectively ΔH 0 f(products) and ΔH 0 f(reactants) are the standard heats of formation of the products and reactants respectively 2. Heat required to raise the temperature of air: q=m air ×c air ×ΔT-----(2) m air = mass of air c air = specific heat capacity of air ΔT= change in temperature Calculation: Step I: Find enthalpy of combustion of methane CH 4 (g)+2O 2 (g)→+2H 2O(g) Based on equation 1 we have: ΔH non =[1×H f 0 (CO 2 )+2×ΔH f 0 (H 2 O)]-[1×ΔH f 0 (CH 4 +2×ΔH 0 f (O 2 )] Substituting for the respective enthalpies formation: ΔH non =[1×(−393...

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Chapter 9, Problem 123E

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To determine: The mass of methane required to raise the temperature of air in the house by

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Chapter 9, Problem 122E

Chapter 9, Problem 124E

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Chapter 9 Solutions

CHEMISTRY:STRUCTURE+PROP.-W/MOD.ACCESS

Ch. 9 - What is thermochemistry? Why is it important?Ch. 9 - What is energy? What is work? List some examples...Ch. 9 - Prob. 3E Ch. 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. 82E Ch. 9 - S3. Hydrazine (N2H4) is a fuel used by some...Ch. 9 - Prob. 84E Ch. 9 - Prob. 85E Ch. 9 - Prob. 86E Ch. 9 - Prob. 87E Ch. 9 - Prob. 88E Ch. 9 - Top fuel dragsters and funny cars burn...Ch. 9 - Prob. 90E Ch. 9 - Prob. 91E Ch. 9 - Rubidium iodide has a lattice energy of-617...Ch. 9 - Prob. 93E Ch. 9 - Prob. 94E Ch. 9 - Use the Born-Haber cycle and data from Appendix...Ch. 9 - Prob. 96E Ch. 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. 105E Ch. 9 - Prob. 106E Ch. 9 - One tablespoon of peanut butter has a mass of 16...Ch. 9 - Prob. 108E Ch. 9 - Prob. 109E Ch. 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. 116E Ch. 9 - Prob. 117E Ch. 9 - Prob. 118E Ch. 9 - Prob. 119E Ch. 9 - Calculate the heat of atomization (see previous...Ch. 9 - Prob. 121E Ch. 9 - Prob. 122E Ch. 9 - Prob. 123E Ch. 9 - Prob. 124E Ch. 9 - Prob. 125E Ch. 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. 128E Ch. 9 - Prob. 129E Ch. 9 - Prob. 130E Ch. 9 - Prob. 131E Ch. 9 - Prob. 132E Ch. 9 - Prob. 133E Ch. 9 - Which expression describes the heat emitted in a...Ch. 9 - Prob. 135E Ch. 9 - Prob. 136E Ch. 9 - Prob. 137E Ch. 9 - Prob. 138E Ch. 9 - Prob. 139E Ch. 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. 143E Ch. 9 - Classify each process as endothermic or...Ch. 9 - A propane tank on a home barbeque contains 10.4 x...Ch. 9 - Prob. 146E Ch. 9 - Consider the decomposition of liquid hydrogen...Ch. 9 - Prob. 148E Ch. 9 - A chemical system produces 155 kJ of heat and does...Ch. 9 - Which sample is most likely to undergo the...Ch. 9 - Prob. 3SAQ Ch. 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. 11SAQ Ch. 9 - Prob. 12SAQ Ch. 9 - Prob. 13SAQ Ch. 9 - Which set of compounds is arranged in order of...Ch. 9 - Prob. 15SAQ

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The mass of methane required to raise the temperature of air in the house by

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