Calculate the enthalpy change, AH°, for the "expansion" of methane: Substance AH; (kJ/mol) CH4 (g)→C(g) + 4H(g) C(g) Express your answer to one decimal place and include the appropriate units. 718.4 CF4(g) - 679.9 • View Available Hint(s) CH4 (g) -74.8 H(g) 217.94 HA HF(g) -268.61 AH° = Value Units en in mind that the enthalpy of formation of an Luuoubmitted this answer. Enter a new answer.

Calculate the enthalpy change, AH°, for the "expansion" of methane: Substance AH; (kJ/mol) CH4 (g)→C(g) + 4H(g) C(g) Express your answer to one decimal place and include the appropriate units. 718.4 CF4(g) - 679.9 • View Available Hint(s) CH4 (g) -74.8 H(g) 217.94 HA HF(g) -268.61 AH° = Value Units en in mind that the enthalpy of formation of an Luuoubmitted this answer. Enter a new answer.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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When ammonia reacts with dinitrogen oxide gas (ΔHf° = 82.05 kJ/mol), liquid water and nitrogen gas are formed. How much heat is liberated or absorbed by the reaction that produces 365 mL of nitrogen gas at 25°C and 743 mm Hg? (in kJ) ΔHf° (kJ/mol) NH3(g) –46.1 H2O(l) –285.8 N2(g) 0 N2O(g) 82.05
Calculate the standard heat of formation of calcium carbide (CaC2(s)) from its elements in kJ/mol using the following thermochemical equations. (hint come up with the overall equation first) Ca(s) + 2H2O(l) ⇒ Ca(OH)2(s) + H2(g) ΔH°= - 414.79 kJ 2C(s) + O2(g) ⇒ 2CO(g) ΔH°= - 221.00 kJ CaO(s) + H2O(l) ⇒ Ca(OH)2(s) ΔH°= - 65.19 kJ 2H2(g) + O2(g) ⇒ 2H2O(l) ΔH°= - 571.80 kJ CaO(s) + 3C(s) ⇒ CaC2(s) + CO(g) ΔH°= + 462.30 kJ
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Using Hess's Law, determine AHf ° for CH4 based on the following reactions. It is known that when methane combustion takes place, 802.37 kJ / mol of heat is released Cgrafito + 2H2 CH4(g) CH4(9) + 202(9) CO29) + 2H2O) A¢H°= -802.37 kJ/mol Cgrafito + O2(g) CO2(g) A:H°= -393.5 kJ/mol 2H2(9) + O2(9) 2H2O(9) A¡H°= -241.83 kJ/mol
Using the provided table, determine the enthalpy for the reaction C3H8 (g) + 5 O2 (g) → 3 CO2 (g) + 4 H2O (g) Substance AH¡ (kJ/mol) C3H® (g) -108.4 O2 (g) CO2 (g) -393.5 H2O (g) -241.8
Thermochemistry and Stoichiometry
2. Consider the following thermochemical equations: C(graphite) + O2 (g) → co2 (g) AH°rn = -393.5 kJ H2 (g) + % 02 (g) → H;0 (/) AHO = -285.8 kJ 2 C:Hs (g) + 702 (g) → 4 CO2 (g) + 6 H20 (1) AH°rn = -3119.6 kJ a. Derive the thermochemical equation describing the combustion of two moles of C(graphite). b. Derive the thermochemical equation describing the combustion of three moles of H2 (g). c. Derive the thermochemical equation describing the synthesis of one mole of C,Hg (9) from carbon dioxide and water. d. Use Hess's Law and the three thermochemical equations you derived in parts a-c to determine the AH°ran for the following reaction: 2C (graphite) + 3 H2 (g) → C;Hs (g)
iv to vi please
10. The following molar enthalpies of formation are given in kJ/mol: AHP[C;Hs(g)] = -104; AHP[CO2(g)] = -394; AHP[H;O(g)] = -242. (a) Calculate the molar heat of combustion of propane (C;Hs) according to the following equation: C;Hs(g) + 5 O2(g) → 3CO2(g) + 4H2O(g); (b) How many grams of propane gas must be combusted to provide enough thermal energy to heat 1.00 kg water from 22.0°C to 100.0°C? (Specific heat of water = 4.184 J/mol.K)
Substance SiO,(s) SICLO H,O) HCIE) AH°, (kJ/mol) -910.7 -687.0 -285.83 -92.307 Calculate the standard enthalpy change for the following reaction: SICI4(1) + 2H20(1) → SIO2 (s) + 4HCI (g)
Enthalpy of formation (kJ/mol) Substance A(s) -5.38 A(g) 20.43 A(I) -3.20 B(s) -18.26 B(g) 27.53 C(s) -13.16 C(I) -4.86 Use the table of above to determine the enthalpy of the following reaction. 7A(s) → 4B(s) + 5C() Your Answer: Answer units