Chemistry Chemistry Practice Problems Solutions Library

Thermochemical Equation Solutions Library

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176 solutions

Thermochemical Equation

Q. Part C. Calculate the enthalpy change for the thermite reaction:2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s) ΔH°rxn = − 850 kJwhen 6.00 mol of Al undergoe...

Solved • Jul 2, 2020

Thermochemical Equation

Q. How many liters of C6H14(l), measured at 20° C, must be burned to provide enough heat to warm 26.8 m3 of water from 18.3 to 33.2°C , assuming that ...

Solved • Jul 2, 2020

Thermochemical Equation

Q. World energy supplies are often measured in the unit of quadrillion British thermal units (1012 Btu), generally called a "quad." In 2015, world ene...

Solved • Jun 30, 2020

Thermochemical Equation

Q. World energy supplies are often measured in the unit of quadrillion British thermal units (1012 Btu), generally called a "quad." In 2015, world ene...

Solved • Jun 30, 2020

Thermochemical Equation

Q. When 0.243 g of Mg metal is combined with enough HCl to make 100 mL of solution in a constant-pressure calorimeter, the following reaction occurs:M...

Solved • Jun 30, 2020

Thermochemical Equation

Q. Consider the following thermochemical equation:2A → AA       ΔHrxn = -42.5 JWhat is the heat associated with the reaction of 8 moles of AExpress yo...

Solved • Jun 25, 2020

Thermochemical Equation

Q. The oxidation of copper(I) oxide, Cu2O(s), to copper(II) oxide, CuO(s), is an exothermic process, 2 Cu2O(s) + O2(g) → 4 CuO (s). The change in enth...

Solved • Apr 29, 2020

Thermochemical Equation

Q. Consider the following reaction: 2Mg(s) + O2(g) → 2MgO(s)        ΔH = -1204 kJHow many grams of MgO are produced during an enthalpy change of -238 ...

Solved • Apr 21, 2020

Thermochemical Equation

Q. Consider the following reaction: 2 Mg(s) + O2(g) → 2MgO(s)        ΔH = -1204 kJIs this reaction exothermic or endothermic? Calculate the amount of ...

Solved • Apr 21, 2020

Thermochemical Equation

Q. For the following reaction, what is ∆H° when 25.0 g of Na2O2(molar mass = 77.98 g mol−1) is reacted with water?2 Na2O2(s) + 2 H2O(l) → 4 NaOH(s) + ...

Solved • Nov 29, 2019

Thermochemical Equation

Q. For the reactionH2(g) + 1/2O2(g) --> H2O(l)              deltaH = –286 kJ/molcalculate the enthalpy change when 2.66 g of water is produced.1. 7...

Solved • Nov 21, 2019

Thermochemical Equation

Q. How much energy (kJ) is required to vaporize 158 g of butane (C4H10) at its boiling point, if Δvap is 24.3 kJ/mole?(a) 15.1 kJ(b) 66.1 kJ(c) 89.4 k...

Solved • Nov 1, 2019

Thermochemical Equation

Q. How much energy is evolved during the reaction of 51.2 g of Al, according to the reaction below?Assume that there is excess Fe2O3.Fe2O3(s) + 2 Al(s...

Solved • Oct 25, 2019

Thermochemical Equation

Q. Given the thermochemical equation: 4 Fe(s) + 3 O2(g) ⟶ 2 Fe2O3(s)         ΔHrxn = –1652 kJ mol–1 What is the ΔH for the reaction when 500.0 g of Fe...

Solved • Oct 4, 2019

Thermochemical Equation

Q. For the reaction, CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (l), ΔH = -890 kJ, what will be the change in enthalpy when 3 moles of methane reacts in exces...

Solved • Aug 27, 2019

Thermochemical Equation

Q. In a constant-pressure calorimeter, 70.0 mL of 0.320 M Ba(OH) 2 was added to 70.0 mL of 0.640 M HCl. The reaction caused the temperature of the sol...

Solved • Aug 7, 2019

Thermochemical Equation

Q. A propane tank on a home barbeque contains 11.3x103 g of propane. Use the value for ΔHrxn (-2044 kJ/mol) to calculate the total amount of heat prod...

Solved • Nov 12, 2018

Thermochemical Equation

Q. Dry chemical hand warmers utilize the oxidation of iron to form iron oxide according to the following reaction:4 Fe(s) + 3 O2(g) → 2 Fe2O3(s)Standa...

Solved • Nov 12, 2018

Thermochemical Equation

Q. Butane combusts according to the equation: C4H10(g) + 13/2 O2(g) → 4 CO2(g) + 5 H2O(g); ΔH˚rxn = -2658 kJ. What mass of butane in grams is necessar...

Solved • Nov 12, 2018

Thermochemical Equation

Q. Butane combusts according to the equation: C4H10(g) + 13/2 O2(g) → 4 CO2(g) + 5 H2O(g); ΔH˚rxn = -2658 kJ. What mass of CO2 is produced in the evol...

Solved • Nov 12, 2018

Thermochemical Equation

Q. Ammonia reacts with oxygen according to the equation: 4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(g); ΔHrxn = -906 kJ. Calculate the heat (in kJ) associat...

Solved • Nov 12, 2018

Thermochemical Equation

Q. The addition of hydrochloric acid to a silver nitrate solution precipitates silver chloride according to the reaction:AgNO3(aq) + HCl(aq) → AgCl(s)...

Solved • Nov 12, 2018

Thermochemical Equation

Q. You may want to reference (Pages 271 - 272) Section 6.7 while completing this problem.The addition of hydrochloric acid to a silver nitrate solutio...

Solved • Nov 12, 2018

Thermochemical Equation

Q. What mass of natural gas (CH4) must you burn to emit 268 kJ of heat?CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(g)             Hrxno= –802.3 kJ/mol

Solved • Nov 12, 2018

Thermochemical Equation

Q. Charcoal is primarily carbon. What mass of CO2 is produced if you burn enough carbon (in the form of charcoal) to produce 5.10 x 102 kJ of heat? Th...

Solved • Nov 12, 2018

Thermochemical Equation

Q. Instant cold packs, often used to ice athletic injuries on the field, contain ammonium nitrate and water separated by a thin plastic divider. When ...

Solved • Nov 12, 2018

Thermochemical Equation

Q. Determine the mass of CO2 produced by burning enough of methane to produce 2.25x102 kJ of heat.CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(g); ΔH˚rxn= -802.3 kJ

Solved • Nov 12, 2018

Thermochemical Equation

Q. Determine the mass of CO2 produced by burning enough of propane to produce 2.25x102 of heat.C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(g); H˚rxn= - 2217 kJ

Solved • Nov 12, 2018

Thermochemical Equation

Q. Determine the mass of CO2 produced by burning enough of octane to produce 2.25x102 of heat.C8H18(l) + 25/2 O2(g) → 8 CO2(g) + 9 H2O(g); ΔH˚rxn= - 5...

Solved • Nov 12, 2018

Thermochemical Equation

Q. The world burns the fossil fuel equivalent of 6x1012 kg of petroleum per year. Assume that all of this petroleum is in the form of octane (C8H18). ...

Solved • Nov 12, 2018

Thermochemical Equation

Q. Hydrogen gas reacts with oxygen to form water.2 H2(g) + O2(g) → 2 H2O(g)         ΔH = –483.5 kJ/molDetermine the minimum mass of hydrogen gas requi...

Solved • Nov 12, 2018

Thermochemical Equation

Q. Manganese reacts with hydrochloric acid to produce manganese(II) chloride and hydrogen gas.Mn(s) + 2 HCl(aq) → MnCl2(aq) + H2(g)When 0.630 g Mn is ...

Solved • Nov 12, 2018

Thermochemical Equation

Q. Natural gas burns in air to form carbon dioxide and water, releasing heat.CH4(g) + O2(g) → CO2(g) + H2O(g); ΔHrxn˚ = –802.3 kJ/molWhat minimum mass...

Solved • Nov 12, 2018

Thermochemical Equation

Q. The propane fuel (C3H8) used in gas barbecues burns according to the following thermochemical equation: C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(g); ΔH...

Solved • Nov 12, 2018

Thermochemical Equation

Q. Find ΔH for the combustion of ethanol (C2H6O) to carbon dioxide and liquid water from the following data. The heat capacity of the bomb calorimeter...

Solved • Nov 12, 2018

Thermochemical Equation

Q. A large sport utility vehicle has a mass of 2600 kg. Calculate the mass of CO2 emitted into the atmosphere upon accelerating the SUV from 0.0 mph t...

Solved • Nov 12, 2018

Thermochemical Equation

Q. Combustion of natural gas (primarily methane) occurs in most household heaters. The heat given off in this reaction is used to raise the temperatur...

Solved • Nov 12, 2018

Thermochemical Equation

Q. A gaseous fuel mixture contains 23.1% methane (CH4), 41.1% ethane (C2H6) and the rest propane (C3H8) by volume.When the fuel mixture contained in a...

Solved • Nov 12, 2018

Thermochemical Equation

Q. LP gas burns according to the following exothermic reaction: C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(g); ΔH˚rxn= -2044 kJ. What mass of LP gas is nece...

Solved • Nov 12, 2018

Thermochemical Equation

Q. Zinc metal reacts with hydrochloric acid according to the following balanced equation: Zn(s) + 2 HCl(aq) → ZnCl2(aq) + H2(g). When 0.116 g of Zn(s)...

Solved • Nov 12, 2018

Thermochemical Equation

Q. Consider the following thermochemical equation for the combustion of acetone (C3H6O), the main ingredient in nail polish remover: C3H6O(l) + 4 O2(g...

Solved • Nov 12, 2018

Thermochemical Equation

Q. Nitromethane (CH3NO2) burns in air to produce significant amounts of heat: 2 CH3NO2(l) + 3/2 O2(g) → 2 CO2(g) + 3 H2O(l) + N2(g); ΔH˚rxn = -1418 kJ...

Solved • Nov 12, 2018

Thermochemical Equation

Q. Titanium reacts with iodine to form titanium(III) iodide, emitting heat, via the following reaction: 2 Ti(s) + 3 I2(g) → 2 TiI3(s); ΔH˚rxn= -839 kJ...

Solved • Nov 12, 2018

Thermochemical Equation

Q. Titanium reacts with iodine to form titanium(III) iodide, emitting heat, via the following reaction: 2 Ti(s) + 3 I2(g) → 2 TiI3(s); ΔH˚rxn= -839 kJ...

Solved • Nov 12, 2018

Thermochemical Equation

Q. Natural gas is very abundant in many Middle Eastern oil fields. However, the costs of shipping the gas to markets in other parts of the world are h...

Solved • Oct 31, 2018

Thermochemical Equation

Q. C6H12O6(s) + 6 O2(g) → 6 CO2(g) + 6 H2O(l), Δ;;;;;;H = –2803 kJBased on the enthalpy of the above reaction, what is the fuel value of glucose on a ...

Solved • Oct 31, 2018

Thermochemical Equation

Q. A pound of plain M&M candies contains 96 g fat, 320 g carbohydrate, and 21 g protein.Table 5.5: Compositions and Fuel ValuesFuelValuekcal/g(Cal...

Solved • Oct 31, 2018

Thermochemical Equation

Q. The heat of combustion of fructose, C6 H12 O6, is -2812 kJ/mol.If a fresh golden delicious apple weighing 4.26 oz (121 g ) contains 17.0 g of fruct...

Solved • Oct 31, 2018

Thermochemical Equation

Q. The heat of combustion of ethanol, C2 H5 OH(l), is -1367 kJ/mol. A batch of sauvignon blanc wine contains 11.6 % ethanol by mass.Assuming the densi...

Solved • Oct 31, 2018

Thermochemical Equation

Q. The standard enthalpies of formation of gaseous propyne (C3H4), propylene (C3H6), and propane (C3H8) are +185.4, +20.4, and -103.8 kJ/mol, respecti...

Solved • Oct 31, 2018

Thermochemical Equation

Q. The standard enthalpies of formation of gaseous propyne (C3H4), propylene (C3H6), and propane (C3H8) are +185.4, +20.4, and -103.8 kJ/mol, respecti...

Solved • Oct 31, 2018

Thermochemical Equation

Q. A stalk of celery has a caloric content (fuel value) of 9.0 kcal. If 1.0 kcal is provided by fat and there is very little protein, estimate the num...

Solved • Oct 31, 2018

Thermochemical Equation

Q. When a 0.240-g sample of benzoic acid is combusted in a bomb calorimeter, the temperature rises 1.643 oC . When a 0.270-g sample of caffeine, C8H10...

Solved • Oct 31, 2018

Thermochemical Equation

Q. The decomposition of ZnCO3(s) into ZnO(s) and CO2(g) at constant pressure requires the addition of 71.5 kJ of heat per mole of ZnCO3.What is the en...

Solved • Oct 31, 2018

Thermochemical Equation

Q. The automobile fuel called E85 consists of 85% ethanol and 15% gasoline. E85 can be used in so-called flex-fuel vehicles (FFVs), which can use gaso...

Solved • Oct 31, 2018

Thermochemical Equation

Q. The automobile fuel called E85 consists of 85% ethanol and 15% gasoline. E85 can be used in so-called flex-fuel vehicles (FFVs), which can use gaso...

Solved • Oct 31, 2018

Thermochemical Equation

Q. The automobile fuel called E85 consists of 85% ethanol and 15% gasoline. E85 can be used in so-called flex-fuel vehicles (FFVs), which can use gaso...

Solved • Oct 31, 2018

Thermochemical Equation

Q. Meals-ready-to-eat (MREs) are military meals that can be heated on a flameless heater. The heat is produced by the following reaction: Mg(s) + 2 H2...

Solved • Oct 31, 2018

Thermochemical Equation

Q. Consider the combustion of a single molecule of CH4(g) forming H2O(l) as a product.How much energy, in J, is produced during this reaction?

Solved • Oct 31, 2018

Thermochemical Equation

Q. Ozone, O3(g), is a form of elemental oxygen that is important in the absorption of ultraviolet radiation in the stratosphere. It decomposes to O2(g...

Solved • Oct 31, 2018

Thermochemical Equation

Q. Ozone, O3(g), is a form of elemental oxygen that is important in the absorption of ultraviolet radiation in the stratosphere. It decomposes to O2(g...

Solved • Oct 31, 2018

Thermochemical Equation

Q. You may want to reference (Pages 172 - 176)Section 5.3 while completing this problem.Consider the following reaction: 2 CH3OH(g) → 2 CH4(g) + O2(g)...

Solved • Oct 31, 2018

Thermochemical Equation

Q. You may want to reference (Pages 172 - 176)Section 5.3 while completing this problem.Consider the following reaction: 2 CH3OH(g) → 2 CH4(g) + O2(g)...

Solved • Oct 31, 2018

Thermochemical Equation

Q. You may want to reference (Pages 172 - 176)Section 5.3 while completing this problem.Consider the following reaction: 2 CH3OH(g)  →  2CH4(g) + O2 (...

Solved • Oct 31, 2018

Thermochemical Equation

Q. Consider the following reaction: 2 Mg(s) + O2(g) → 2 MgO(s), ΔH = –1204 kJCalculate the amount of heat transferred when 3.56 g of Mg(s) reacts at c...

Solved • Oct 31, 2018

Thermochemical Equation

Q. Consider the following reaction: 2 Mg(s) + O2(g) → 2 MgO(s), ΔH = –1204 kJHow many grams of MgO are produced during an enthalpy change of –234 kJ ?

Solved • Oct 31, 2018

Thermochemical Equation

Q. Consider the following reaction:2Mg(s) + O2 (g) → 2MgO(s) ΔH = - 1204How many kilojoules of heat are absorbed when 40.5 g of MgO(s) is decomposed i...

Solved • Oct 31, 2018

Thermochemical Equation

Q. When solutions containing silver ions and chloride ions are mixed, silver chloride precipitates: Ag+(aq) + Cl–(aq) → AgCl(s), ΔH = –65.5 kJCalculat...

Solved • Oct 31, 2018

Thermochemical Equation

Q. When solutions containing silver ions and chloride ions are mixed, silver chloride precipitates: Ag+(aq) + Cl–(aq) → AgCl(s), ΔH = –65.5 kJCalculat...

Solved • Oct 31, 2018

Thermochemical Equation

Q. When solutions containing silver ions and chloride ions are mixed, silver chloride precipitates: Ag+(aq) + Cl–(aq) → AgCl(s), ΔH = –65.5 kJCalculat...

Solved • Oct 31, 2018

Thermochemical Equation

Q. At one time, a common means of forming small quantities of oxygen gas in the laboratory was to heat KClO3: 2 KClO3(s) → 2 KCl(s) + 3 O2(g), ΔH = –8...

Solved • Oct 31, 2018

Thermochemical Equation

Q. At one time, a common means of forming small quantities of oxygen gas in the laboratory was to heat KClO3: 2 KClO3(s) → 2 KCl(s) + 3 O2(g), ΔH = –8...

Solved • Oct 31, 2018

Thermochemical Equation

Q. A sample of a hydrocarbon is combusted completely in O2(g) to produce 24.01 g CO2(g), 4.917 g H2O(g), and 342 kJ of heat.Calculate the value of ΔHf...

Solved • Oct 31, 2018

Thermochemical Equation

Q. The methane molecule, CH4, has the geometry shown in following figure. Imagine a hypothetical process in which the methane molecule is "expanded," ...

Solved • Oct 31, 2018

Thermochemical Equation

Q. You may want to reference (Pages 191 - 192) Section 5.8 while completing this problem.The sun supplies about 1.1 kilowatt(s) of energy for each squ...

Solved • Oct 31, 2018

Thermochemical Equation

Q. It is estimated that the net amount of carbon dioxide fixed by photosynthesis on the landmass of the Earth is 5.5 x 1016 g of CO2. All this carbon ...

Solved • Oct 31, 2018

Thermochemical Equation

Q. It is estimated that the net amount of carbon dioxide fixed by photosynthesis on the landmass of the Earth is 5.5 x 1016 g of CO2. All this carbon ...

Solved • Oct 31, 2018

Thermochemical Equation

Q. Consider two solutions, the first being 50.0 mL of 1.00 M CuSO4 and the second 50.0 mL of 2.00 M KOH. When the two solutions are mixed in a constan...

Solved • Oct 31, 2018

Thermochemical Equation

Q. Ammonia (NH3) boils at -33oC; at this temperature it has a density of 0.81 g/cm3. The enthalpy of formation of NH3(g) is -46.2 kJ/mol, and the enth...

Solved • Oct 31, 2018

Thermochemical Equation

Q. Ammonia (NH3) boils at -33oC; at this temperature it has a density of 0.81 g/cm3. The enthalpy of formation of NH3(g) is -46.2 kJ/mol, and the enth...

Solved • Oct 31, 2018

Thermochemical Equation

Q. Three common hydrocarbons that contain four carbons are listed here, along with their standard enthalpies of formation:HydrocarbonFormulaHf(kJ/mol)...

Solved • Oct 31, 2018

Thermochemical Equation

Q. Three common hydrocarbons that contain four carbons are listed here, along with their standard enthalpies of formation:HydrocarbonFormulaΔH˚f(kJ/mo...

Solved • Oct 31, 2018

Thermochemical Equation

Q. Three common hydrocarbons that contain four carbons are listed here, along with their standard enthalpies of formation:HydrocarbonFormulaHf(kJ/mol)...

Solved • Oct 31, 2018

Thermochemical Equation

Q. Three common hydrocarbons that contain four carbons are listed here, along with their standard enthalpies of formation:HydrocarbonFormulaHf(kJ/mol)...

Solved • Oct 31, 2018

Thermochemical Equation

Q. Three common hydrocarbons that contain four carbons are listed here, along with their standard enthalpies of formation:HydrocarbonFormulaHf(kJ/mol)...

Solved • Oct 31, 2018

Thermochemical Equation

Q. Consider the decomposition of liquid benzene, C6H6(l), to gaseous acetylene, C2H2(g): C6H6(l) → 3 C2H2(g), ΔH = +630 kJWhat is ΔH for the formation...

Solved • Oct 31, 2018

Thermochemical Equation

Q. Ethanol (C2H5OH) is currently blended with gasoline as an automobile fuel.Calculate the heat produced per liter of ethanol by combustion of ethanol...

Solved • Oct 31, 2018

Thermochemical Equation

Q. Ethanol (C2H5OH) is currently blended with gasoline as an automobile fuel.Calculate the mass of CO2 produced per kJ of heat emitted.

Solved • Oct 31, 2018

Thermochemical Equation

Q. Methanol (CH3OH) is used as a fuel in race cars.You may want to reference (Pages 187 - 190) Section 5.7 while completing this problem.Write a balan...

Solved • Oct 31, 2018

Thermochemical Equation

Q. The following table contains some standard enthalpies of formation, pandoc: Error at "source" (line 1, column 32): unexpected "{" expecting letter ...

Solved • Oct 31, 2018

Thermochemical Equation

Q. A 2.250 -g sample of quinone (C6 H4 O2 ) is burned in a bomb calorimeter whose total heat capacity is 7.854kJ/oC. The temperature of the calorimete...

Solved • Oct 31, 2018

Thermochemical Equation

Q. A 2.250 -g sample of quinone (C6 H4 O2 ) is burned in a bomb calorimeter whose total heat capacity is 7.854kJ/oC. The temperature of the calorimete...

Solved • Oct 31, 2018

Thermochemical Equation

Q. A 1.800-g sample of solid phenol (C6H5OH(s)) was burned in a bomb calorimeter, which has a total heat capacity of 11.66 kJ/oC. The temperature of t...

Solved • Oct 31, 2018

Thermochemical Equation

Q. A 1.800-g sample of solid phenol (C6H5OH(s)) was burned in a bomb calorimeter, which has a total heat capacity of 11.66 kJ/oC. The temperature of t...

Solved • Oct 31, 2018

Thermochemical Equation

Q. Under constant-volume conditions the heat of combustion of glucose (C6H12O6) is 15.57 kJ/g. A 3.550 -g sample of glucose is burned in a bomb calori...

Solved • Oct 31, 2018

Thermochemical Equation

Q. Under constant-volume conditions the heat of combustion of glucose (C6H12O6) is 15.57 kJ/g. A 3.550 -g sample of glucose is burned in a bomb calori...

Solved • Oct 31, 2018

Thermochemical Equation

Q. Under constant-volume conditions the heat of combustion of benzoic acid (C6H5COOH) is 26.38 kJ/g. A 2.760 -g sample of benzoic acid is burned in a ...

Solved • Oct 31, 2018

Thermochemical Equation

Q. The enthalpy of neutralization for the reaction of a strong acid with a strong base is 256 kJ/mol water produced. How much energy will be released ...

Solved • Oct 18, 2018

Thermochemical Equation

Q. Consider the dissolution of CaCl2:CaCl2 (s) → Ca2+(aq) + 2 Cl- (aq)          ΔH = -81.5 kJ An 11.0-g sample of CaCl2 is dissolved in 125 g water, w...

Solved • Oct 18, 2018

Thermochemical Equation

Q. Consider the combustion of propane:C3H8 + 5O2 → 3CO2 + 4H2O           ΔH = -2221 kJAssume that all the heat in Example 7‑3 comes from the combustio...

Solved • Oct 17, 2018