1. Determine the change in enthalpy for the following reaction:N2Ha(1) + 2H2O2(1) → N2(g) + 4H2O(I)Given the following information:AH° = -622.2kJN2H4(1) + O2 (g) → N2(g) + 2H2O(1)H2(g) + 1/2 O2(g) → H2O(I)H2(g) + O2(g) – H2O2(l)%3DAH° = -285.8 kJAH° = -187.8 kJ%3D

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Answered: 1. Determine the change in enthalpy for…

Chemistry

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Author:Steven S. Zumdahl

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Chapter6: Thermochemistry

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Problem 77E: Give the definition of the standard enthalpy of formation for a substance. Write separate reactions...

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Another reaction that is used to propel rockets is N2O4(l)+2N2H4(l)3N2(g)+4H2O(g) This reaction has the advantage that neither product is toxic, so no dangerous pollution is released. When the reaction consumes 10.0 g liquid N2O4, it releases 124 kJ of heat. (a) Is the sign of the enthalpy change positive or negative? (b) What is the value of H for the chemical equation if it is understood to be written in molar quantities?
A 250-g sample of water at 20.0C is placed in a freezer that is held at a constant temperature of 20.0C. Considering the water as the system, answer the following questions: a What is the sign of qsys for the water after it is placed in the freezer? b After a few hours, what will be the state of the water? c How will the initial enthalpy for the water compare with the final enthalpy of the water after it has spent several hours in the freezer? d What will the temperature of the water be after several hours in the freezer?
Gasohol, a mixture of gasoline and ethanol, C2H5OH, is used as automobile fuel. The alcohol releases energy in a combustion reaction with O2. C2H5OH(l)+3O2(g)2CO2(g)+3H2O(l) If 0.115 g ethanol evolves 3.62 kJ when burned at constant pressure, calculate the combustion enthalpy for ethanol.
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Is the following reaction the appropriate one to use in determining the enthalpy of formation of methane, CH4(g)? Why or why not? C(g)+4H(g)CH4(g)
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Use Appendix L to find the standard enthalpies of formation of oxygen atoms, oxygen molecules (O2), and ozone (O3). What is the standard state of oxygen? Is the formation of oxygen atoms from O2 exothermic? What is the enthalpy change for the formation of 1 mol of O3 from O2?
9.73 Without looking up any numerical data or doing calculations, predict whether the enthalpy change for each of the following reactions should he positive, negative, or zero. (a) H2O(l)H2O(s) (b) N2(g)2N(g) (c) CH4(g)+2O2(g)CO2(g)+2H2O(l) (d) CO2(s)CO2(g)
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1. Determine the change in enthalpy for the following reaction: N2Ha(1) + 2H2O2(1) → N2(g) + 4H2O(I) Given the following information: AH° = -622.2kJ N2H4(1) + O2 (g) → N2(g) + 2H2O(1) H2(g) + 1/2 O2(g) → H2O(I) H2(g) + O2(g) – H2O2(l) %3D AH° = -285.8 kJ AH° = -187.8 kJ %3D