Calculate the Arzn Hofor the reaction 2 Fe(s) + O₂(g) → Fe₂O3(s) using the reactions below. 1 Fe(s) + 3 H₂O(1)→ Fe(OH)3 (8) + H₂(g) Am H = +161 kJ/mol Arn H=-286 kJ/mol 2 H₂(g) + O2 → H₂O(1) 3 Fe₂O3(s) + 3 H₂O(l) → 2 Fe(OH)3 (8) Ar H=+289 kJ/mol Which of the statements below are false for the calculation? I. Reaction 1 must be multiplied by 2 to give 2 Fe(s) + 6 H₂O(1)→2 Fe(OH)3(s) + 3 H₂(g), Arz H=+322 kJ/mol. II. Reaction 1 must be divided by 3 to give Fe(s) + H₂O(1)→ Fe(OH),(s) + H₂(9), Aram H = +53.67 kJ/mol. III. Reaction 2 must be multiplied by 3 to give 3 H₂(g) + O₂ + 3 H₂O(1), AH = -858 kJ/mol. IV. Reaction 3 must be reversed to give 2 Fe(OH)3 (8)→ Fe₂O3(s) + 3 H₂O(1), AH = 289 kJ/mol. V. The Aran Hº for 2 Fe(s) + O₂(g) → Fe₂O₂ (s) is 825 kJ/mol. II, IV, and V I and IV II and IV II, III, and V I, III, and V Clear my selection
Calculate the Arzn Hofor the reaction 2 Fe(s) + O₂(g) → Fe₂O3(s) using the reactions below. 1 Fe(s) + 3 H₂O(1)→ Fe(OH)3 (8) + H₂(g) Am H = +161 kJ/mol Arn H=-286 kJ/mol 2 H₂(g) + O2 → H₂O(1) 3 Fe₂O3(s) + 3 H₂O(l) → 2 Fe(OH)3 (8) Ar H=+289 kJ/mol Which of the statements below are false for the calculation? I. Reaction 1 must be multiplied by 2 to give 2 Fe(s) + 6 H₂O(1)→2 Fe(OH)3(s) + 3 H₂(g), Arz H=+322 kJ/mol. II. Reaction 1 must be divided by 3 to give Fe(s) + H₂O(1)→ Fe(OH),(s) + H₂(9), Aram H = +53.67 kJ/mol. III. Reaction 2 must be multiplied by 3 to give 3 H₂(g) + O₂ + 3 H₂O(1), AH = -858 kJ/mol. IV. Reaction 3 must be reversed to give 2 Fe(OH)3 (8)→ Fe₂O3(s) + 3 H₂O(1), AH = 289 kJ/mol. V. The Aran Hº for 2 Fe(s) + O₂(g) → Fe₂O₂ (s) is 825 kJ/mol. II, IV, and V I and IV II and IV II, III, and V I, III, and V Clear my selection
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Chapter6: Thermochemisty
Section: Chapter Questions
Problem 6.132QP
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Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
Question
Transcribed Image Text:Calculate the Aran Hº for the reaction 2 Fe(s) + O2(g) → Fer Os (s) using the reactions below.
1
1 Fe(s) + 3 H₂O(l) → Fe(OH)3 (8) +
H₂(9) AH = +161 kJ/mol
Aran H = -286 kJ/mol
2 H₂(g) + O₂ → H₂O(1)
3 Fe₂O3 (8) + 3 H₂O(l) → 2 Fe(OH), (8) Ara H+289 kJ/mol
Which of the statements below are false for the calculation?
1. Reaction 1 must be multiplied by 2 to give 2 Fe(s) + 6 H₂O(1)→2 Fe(OH),(s) + 3 H₂(g), Ar H=+322 kJ/mol.
II. Reaction 1 must be divided by 3 to give Fe(s) + H₂O(1)→ Fe(OH),(s) + H₂(g), Aram H = +53.67 kJ/mol.
III. Reaction 2 must be multiplied by 3 to give 3 H₂(g) + O₂ + 3 H₂O(1), AH-858 kJ/mol.
IV. Reaction 3 must be reversed to give 2 Fe(OH)3(s) → Fe₂O3(s) + 3 H₂O(1), AH = 289 kJ/mol.
V. The Aren Ho for 2 Fe(s) + O₂(g) → Fe₂O3 (8) is 825 kJ/mol.
II, IV, and V
I and IV
II and IV
II, III, and V
I, III, and V
Clear my selection
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