Exam1Review-S10

Exam1Review-S10 - Exam 1 Study Questions for Review Session...

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Exam 1 Study Questions for Review Session Hydrazine, N 2 H 4 , is a commonly used liquid rocket fuel. The combustion of hydrazine is shown below. Let’s explore some thermodynamic and kinetic aspects of this combustion process. N N H H H H O O + N N + O H H 2 1) Assuming all the reactants and products are gases, predict the change in enthalpy and entropy. Justify your decisions. 2) Do you predict the reaction favored at all temperatures, unfavored at all temperartures or does it exhibit temperature dependent favorability? Explain. 3) Verify your predictions by calculating ΔH, ΔS and ΔG at 25°C. Do they match? 4) Without doing a calculation, predict which of the following compounds would be the best replacement for hydrazine as a rocket fuel. Explain your answer. N N H H N H H H N N H N H H 5) Hydrazine can decompose to form nitrogen and hydrogen. Write the K expression and calculate K for this process at 500°C. Is this process more or less favored at even higher temperatures? Explain. Is there a cross-over temperature?
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This note was uploaded on 03/29/2010 for the course CHEM 152 taught by Professor Grall during the Spring '08 term at Arizona.

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Exam1Review-S10 - Exam 1 Study Questions for Review Session...

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