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2. Consider the following three reactions: 2 Fe(s) +6 HCI(aq) → 2 FeCh (aq) +3 H, (g) Fe,0,(s) +6 HC1(aq)2 FeCl, (aq) +3 H,O(1) 2 H, (g) +0,(g) 2 H,O(1) (12.13) (12.14) AHC (12.15) Show how these equations must be summed together according to Hess's Law to determine AH for the combustion of iron (target equation shown below). Also show clearly how the AH values of each of the three reactions must be manipulated to determine the enthalpy of combustion of iron. 4 Fe(s) +30,(g) – 2 Fe,0,(s) AH =? (12.16)

2. Consider the following three reactions: 2 Fe(s) +6 HCI(aq) → 2 FeCh (aq) +3 H, (g) Fe,0,(s) +6 HC1(aq)2 FeCl, (aq) +3 H,O(1) 2 H, (g) +0,(g) 2 H,O(1) (12.13) (12.14) AHC (12.15) Show how these equations must be summed together according to Hess's Law to determine AH for the combustion of iron (target equation shown below). Also show clearly how the AH values of each of the three reactions must be manipulated to determine the enthalpy of combustion of iron. 4 Fe(s) +30,(g) – 2 Fe,0,(s) AH =? (12.16)

Chemistry
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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Pre-laboratory Assignment: Calorimetry and Hess’s Law

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2. Consider the following three reactions: 2 Fe(s) +6 HCI(aq) → 2 FeCL (aq) +3H,(g) (12.13) Fe,0,(s) +6 HC1(aq)2 FeCl, (aq) +3 H,O(1) 2 H, (g) +0,(g) 2 H,O(1) AHB (12.14) AHC (12.15) Show how these equations must be summed together according to Hess's Law to determine AH for the combustion of iron (target equation shown below). Also show clearly how the AH values of each of the three reactions must be manipulated to determine the enthalpy of combustion of iron. 4 Fe(s) +3 0,(g) 2 Fe,O,(s) AH =? (12.16) 3. Using tabulated AH values in the text, determine the enthalpy change (in kJ) that occurs during the formation of water from its elements: 2 H, (g) + 0,(g)→ 2 H,O(1) ΔΗ (12.17) Note that this value (and the equation) will be used in your data analysis for this lab.
Transcribed Image Text:2. Consider the following three reactions: 2 Fe(s) +6 HCI(aq) → 2 FeCL (aq) +3H,(g) (12.13) Fe,0,(s) +6 HC1(aq)2 FeCl, (aq) +3 H,O(1) 2 H, (g) +0,(g) 2 H,O(1) AHB (12.14) AHC (12.15) Show how these equations must be summed together according to Hess's Law to determine AH for the combustion of iron (target equation shown below). Also show clearly how the AH values of each of the three reactions must be manipulated to determine the enthalpy of combustion of iron. 4 Fe(s) +3 0,(g) 2 Fe,O,(s) AH =? (12.16) 3. Using tabulated AH values in the text, determine the enthalpy change (in kJ) that occurs during the formation of water from its elements: 2 H, (g) + 0,(g)→ 2 H,O(1) ΔΗ (12.17) Note that this value (and the equation) will be used in your data analysis for this lab.
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