2. Energy Reactants 6.4x10²kJ Products Which of these reactions could correspond to the above energy diagram? (Justify your answer with math - if all you do is choose the correct reaction, you'll get 1/2.) a) CH3OH(1) + CO(g) → CH3COOH (1) b) MgCl2(s) → Mg(s) + Cl2(g) c) CH3OH(1) + O2(g) → CO2(g) + 2H₂O(g) d) 2HCl(g) + Mg(s) → H2(g) + MgCl2(s)

2. Energy Reactants 6.4x10²kJ Products Which of these reactions could correspond to the above energy diagram? (Justify your answer with math - if all you do is choose the correct reaction, you'll get 1/2.) a) CH3OH(1) + CO(g) → CH3COOH (1) b) MgCl2(s) → Mg(s) + Cl2(g) c) CH3OH(1) + O2(g) → CO2(g) + 2H₂O(g) d) 2HCl(g) + Mg(s) → H2(g) + MgCl2(s)

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

Chapter6: Thermochemistry

Section: Chapter Questions

Problem 46E: The reaction SO3(g)+H2O(l)H2SO4(aq) is the last step in the commercial production of sulfuric acid....

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Gas A2 reacts with gas B2 to form gas AB at a constant temperature. The bond energy of AB is much greater than that of either reactant. What can be said about the sign of H? SSurr? S? Explain how potential energy changes for this process. Explain how random kinetic energy changes during the process.
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Would the amount of heat absorbed by the dissolution in Example 5.6 appear greater, lesser, or remain the same if the heat capacity of the calorimeter were taken into account? Explain your answer.
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Coal is used as a fuel in some electric-generating plants. Coal is a complex material, but for simplicity we may consider it to be a form of carbon. The energy that can be derived from a fuel is sometimes compared with the enthalpy of the combustion reaction: C(s)+O2(g)CO2(g) Calculate the standard enthalpy change for this reaction at 25C. Actually, only a fraction of the heat from this reaction is available to produce electric energy. In electric generating plants, this reaction is used to generate heat for a steam engine, which turns the generator. Basically the steam engine is a type of heat engine in which steam enters the engine at high temperature (Th), work is done, and the steam then exits at a lower temperature (Tl). The maximum fraction, f, of heat available to produce useful energy depends on the difference between these temperatures (expressed in kelvins), f = (Th Tl)/Th. What is the maximum heat energy available for useful work from the combustion of 1.00 mol of C(s) to CO2(g)? (Assume the value of H calculated at 25C for the heat obtained in the generator.) It is possible to consider more efficient ways to obtain useful energy from a fuel. For example, methane can be burned in a fuel cell to generate electricity directly. The maximum useful energy obtained in these cases is the maximum work, which equals the free-energy change. Calculate the standard free-energy change for the combustion of 1.00 mol of C(s) to CO2(g). Compare this value with the maximum obtained with the heat engine described here.