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For which of the following reactions is A; H° equal to Af H° of the product(s)? The standard heat of formation, Af H°, is defined as the enthalpy change for the You do not need to look up any values to answer this question. formation of one mole of substance from its constituent elements in their standard states. Thus, elements in their standard states have Af H° = 0. Heat of formation values can be used to calculate the enthalpy change of any reaction. Check all that apply. > View Available Hint(s) Consider, for example, the reaction 2NO(9) + O2(9)= 2NO2(g) O Li(s) + ÷F2(1)→LIF(s) with heat of formation values given by the following table: O C(s) + O2(9)→CO2(9) AH° (kJ mol-1) Substance O CO(9) + O2(9)→CO2(9) NO(9) 90.2 O2(9) O 2Li(s) + F2 (9)→2LİF(s) NO2(9) O Li(s) + ¿F2(9)→LIF(s) 33.2 O BaCO3 (s)→BaO(s) + CO2(g) Then the heat of formation for the overall reaction is Δ,ΗΣ n, Δι Η' (products) -Σ, Δ Η ' (reactants) = 2(33.2) = -114 kJ mol-1 [2(90.2) + 0]

For which of the following reactions is A; H° equal to Af H° of the product(s)? The standard heat of formation, Af H°, is defined as the enthalpy change for the You do not need to look up any values to answer this question. formation of one mole of substance from its constituent elements in their standard states. Thus, elements in their standard states have Af H° = 0. Heat of formation values can be used to calculate the enthalpy change of any reaction. Check all that apply. > View Available Hint(s) Consider, for example, the reaction 2NO(9) + O2(9)= 2NO2(g) O Li(s) + ÷F2(1)→LIF(s) with heat of formation values given by the following table: O C(s) + O2(9)→CO2(9) AH° (kJ mol-1) Substance O CO(9) + O2(9)→CO2(9) NO(9) 90.2 O2(9) O 2Li(s) + F2 (9)→2LİF(s) NO2(9) O Li(s) + ¿F2(9)→LIF(s) 33.2 O BaCO3 (s)→BaO(s) + CO2(g) Then the heat of formation for the overall reaction is Δ,ΗΣ n, Δι Η' (products) -Σ, Δ Η ' (reactants) = 2(33.2) = -114 kJ mol-1 [2(90.2) + 0]

Chemistry
Chemistry
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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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For which of the following reactions is Ar H° equal to Af H° of the product(s)? The standard heat of formation, Af H°, is defined as the enthalpy change for the formation of one mole of substance from its constituent elements in their standard You do not need to look up any values to answer this question. states. Thus, elements in their standard states have Af H° = 0. Heat of formation values can be used to calculate the enthalpy change of any reaction. Check all that apply. • View Available Hint(s) Consider, for example, the reaction 2NO(9) + O2(9) 2ΝΟ (9) O Li(s) + ¿F2(1)–→LİF(s) with heat of formation values given by the following table: O C(s) + O2(9)→CO2(9) Af H° (kJ mol-1) Substance O CO(9) + 02(9)→CO2(9) NO(9) 90.2 O2 (9) O 2Li(s) + F2 (9)–→2LİF(s) NO2(9) Li(s) + F2(9)→LİF(s) 33.2 O BaCO3 (s)→BaO(s) + CO2(9) Then the heat of formation for the overall reaction is Δ.ΗΣη, Δ Η (products ) -ΣΤ, Δ Η' (reactants) 2(33.2) [2(90.2) + 0] -114 kJ mol-1 = The combustion of pentane, C5 H12, occurs via the reaction C5H12(9) + 802(9)→5CO2(9)+ 6H2O(9) with heat of formation values given by the following table: Af H° (kJ mol-1) Substance C5H12 (9) -119.9 CO2 (9) -393.5 H2O(g) -241.8 Calculate the enthalpy for the combustion of pentane. Express your answer to four significant figures and include the appropriate units. • View Available Hint(s) ? A;H° = Value Units Submit
Transcribed Image Text:For which of the following reactions is Ar H° equal to Af H° of the product(s)? The standard heat of formation, Af H°, is defined as the enthalpy change for the formation of one mole of substance from its constituent elements in their standard You do not need to look up any values to answer this question. states. Thus, elements in their standard states have Af H° = 0. Heat of formation values can be used to calculate the enthalpy change of any reaction. Check all that apply. • View Available Hint(s) Consider, for example, the reaction 2NO(9) + O2(9) 2ΝΟ (9) O Li(s) + ¿F2(1)–→LİF(s) with heat of formation values given by the following table: O C(s) + O2(9)→CO2(9) Af H° (kJ mol-1) Substance O CO(9) + 02(9)→CO2(9) NO(9) 90.2 O2 (9) O 2Li(s) + F2 (9)–→2LİF(s) NO2(9) Li(s) + F2(9)→LİF(s) 33.2 O BaCO3 (s)→BaO(s) + CO2(9) Then the heat of formation for the overall reaction is Δ.ΗΣη, Δ Η (products ) -ΣΤ, Δ Η' (reactants) 2(33.2) [2(90.2) + 0] -114 kJ mol-1 = The combustion of pentane, C5 H12, occurs via the reaction C5H12(9) + 802(9)→5CO2(9)+ 6H2O(9) with heat of formation values given by the following table: Af H° (kJ mol-1) Substance C5H12 (9) -119.9 CO2 (9) -393.5 H2O(g) -241.8 Calculate the enthalpy for the combustion of pentane. Express your answer to four significant figures and include the appropriate units. • View Available Hint(s) ? A;H° = Value Units Submit
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