1. Hydrogen that is stored "stored" in NH3 can be released through the reaction: 2 NH3(g) → N₂(g) + 3 H₂(g) AHxn = +92 kJ/mol The resulting H₂(g) is then used as a fuel through the combustion reaction: 2 H₂(g) + O2(g) → 2 H₂O(1) AHxn=-572 kJ/mol This two-step process involves an endothermic reaction (first reaction) and an exothermic reaction (second reaction) where H₂ is the intermediate. The overall reaction is exothermic and heat is released. a. Write the overall reaction equation and AHrxn (in kJ/mol) for this two-step process. b. Calculate the amount of heat released at constant pressure when 50.0 kg of NH3 (MW 17.031 g/mol) is used as a hydrogen carrier in the two-step process shown above.

1. Hydrogen that is stored "stored" in NH3 can be released through the reaction: 2 NH3(g) → N₂(g) + 3 H₂(g) AHxn = +92 kJ/mol The resulting H₂(g) is then used as a fuel through the combustion reaction: 2 H₂(g) + O2(g) → 2 H₂O(1) AHxn=-572 kJ/mol This two-step process involves an endothermic reaction (first reaction) and an exothermic reaction (second reaction) where H₂ is the intermediate. The overall reaction is exothermic and heat is released. a. Write the overall reaction equation and AHrxn (in kJ/mol) for this two-step process. b. Calculate the amount of heat released at constant pressure when 50.0 kg of NH3 (MW 17.031 g/mol) is used as a hydrogen carrier in the two-step process shown above.

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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A 8.17 g sample of an unknown salt (MM = 116.82 g/mol) is dissolved in 150.00 g water in a coffee cup calorimeter. Before placing the sample in the water, the temperature of the salt and water is 23.72°C. After the salt has completely dissolved, the temperature of the solution is 28.54°C. How many moles of the unknown salt were used in the reaction?
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Consider these reactions: Reaction 1: H₂(g) + Cl₂ (g) 2HCl(g) AH-184.6 kJ Reaction 2: 20F2(g) O₂(g) + 2 F₂ (g) AH = -49.4 kJ Reaction 3: N₂(g) + 2O₂(g) · 2NO₂(g) AH = +66.4 kJ
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