Chemistry: Principles and Practice
3rd Edition
ISBN: 9780534420123
Author: Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher: Cengage Learning
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Textbook Question
Chapter 17, Problem 17.5QE
When a rocket is launched, the burning gases are the source of the motion. If the system is the rocket (including fuel), what is the sign of the work?
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Chapter 17 Solutions
Chemistry: Principles and Practice
Ch. 17 - Prob. 17.1QECh. 17 - How is the sign of q, heat, defined? How does it...Ch. 17 - Identify the sign of the work when a fuel-oxygen...Ch. 17 - What is the sign of the work when a refrigerator...Ch. 17 - When a rocket is launched, the burning gases are...Ch. 17 - Prob. 17.6QECh. 17 - Prob. 17.7QECh. 17 - Prob. 17.8QECh. 17 - Prob. 17.9QECh. 17 - Explain why absolute enthalpies and energies...
Ch. 17 - Explain why absolute entropies can be measured.Ch. 17 - Under what conditions is the entropy of a...Ch. 17 - Prob. 17.13QECh. 17 - Prob. 17.14QECh. 17 - Prob. 17.15QECh. 17 - Prob. 17.16QECh. 17 - Prob. 17.17QECh. 17 - Prob. 17.18QECh. 17 - The free energy for a reaction decreases as...Ch. 17 - The equilibrium constant for a reaction decreases...Ch. 17 - When solid sodium acetate crystallizes from a...Ch. 17 - Prob. 17.22QECh. 17 - Prob. 17.23QECh. 17 - Prob. 17.24QECh. 17 - Prob. 17.25QECh. 17 - Prob. 17.26QECh. 17 - Prob. 17.27QECh. 17 - Calculate w for the following reactions that occur...Ch. 17 - How much work is done if a balloon expands from...Ch. 17 - Prob. 17.30QECh. 17 - Prob. 17.31QECh. 17 - A piston initially contains 688 mL of gas at 1.22...Ch. 17 - A 220-L cylinder contains an ideal gas at a...Ch. 17 - Prob. 17.34QECh. 17 - Prob. 17.35QECh. 17 - For a process, w = 34 J and q = 109 J. What is E...Ch. 17 - Prob. 17.37QECh. 17 - Prob. 17.38QECh. 17 - A reaction between a solid and a liquid produces...Ch. 17 - Prob. 17.40QECh. 17 - Prob. 17.41QECh. 17 - When an ideal gas is compressed at constant...Ch. 17 - Prob. 17.43QECh. 17 - Prob. 17.44QECh. 17 - Prob. 17.45QECh. 17 - Prob. 17.46QECh. 17 - Prob. 17.47QECh. 17 - Prob. 17.48QECh. 17 - What is the sign of the entropy change for each of...Ch. 17 - For each process, tell whether the entropy change...Ch. 17 - Prob. 17.51QECh. 17 - Prob. 17.52QECh. 17 - Prob. 17.53QECh. 17 - Prob. 17.54QECh. 17 - Use the data in Appendix G to calculate the...Ch. 17 - Prob. 17.56QECh. 17 - Prob. 17.57QECh. 17 - Prob. 17.58QECh. 17 - Calculate G for the following reactions and state...Ch. 17 - Prob. 17.60QECh. 17 - Prob. 17.63QECh. 17 - Prob. 17.64QECh. 17 - Prob. 17.65QECh. 17 - Prob. 17.66QECh. 17 - What is the sign of the standard Gibbs free-energy...Ch. 17 - What is the sign of the standard Gibbs free-energy...Ch. 17 - What is the sign of the standard Gibbs free-energy...Ch. 17 - What is the sign of the standard Gibbs free-energy...Ch. 17 - Predict the temperature at which the reaction in...Ch. 17 - Prob. 17.72QECh. 17 - Prob. 17.73QECh. 17 - Prob. 17.74QECh. 17 - Prob. 17.75QECh. 17 - Prob. 17.76QECh. 17 - Prob. 17.77QECh. 17 - Prob. 17.78QECh. 17 - Prob. 17.79QECh. 17 - Prob. 17.80QECh. 17 - Prob. 17.81QECh. 17 - Determine whether the condensation of nitromethane...Ch. 17 - At 298 K, G = 70.52 kJ for the reaction 2NO(g) +...Ch. 17 - Prob. 17.84QECh. 17 - Prob. 17.85QECh. 17 - Prob. 17.86QECh. 17 - Prob. 17.87QECh. 17 - Prob. 17.88QECh. 17 - For each reaction, an equilibrium constant at 298...Ch. 17 - For each reaction, an equilibrium constant at 298...Ch. 17 - Prob. 17.91QECh. 17 - Use the data in Appendix G to calculate the value...Ch. 17 - Suppose you have an endothermic reaction with H =...Ch. 17 - Suppose you have an endothermic reaction with H =...Ch. 17 - Suppose you have an exothermic reaction with H =...Ch. 17 - Suppose you have an exothermic reaction with H =...Ch. 17 - Calculate G and G at 303 C for the following...Ch. 17 - Calculate G and G at 37 C for the following...Ch. 17 - Prob. 17.101QECh. 17 - Prob. 17.102QECh. 17 - A 220-ft3 sample of gas at standard temperature...Ch. 17 - What is the sign of the standard Gibbs free-energy...Ch. 17 - Elemental boron, in the form of thin fibers, can...Ch. 17 - Calculate the standard Gibbs free-energy change...Ch. 17 - The thermite reaction is 2Al(s) + Fe2O3(s) ...Ch. 17 - Chemists and engineers who design nuclear power...
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- What is the sign of the work when a refrigerator compresses a gas (the system) to a liquid during the refrigeration cycle?arrow_forwardIdentify the sign of the work when a fuel-oxygen mixture (the system) burns, propelling an automobile (part of the surroundings).arrow_forwardThe statement Energycan beneithercreatednor destroyedis sometimes used as an equivalent statement of the first law of thermodynamics. There areinaccuracies to the statement, however. Restate it tomake it less inaccurate.arrow_forward
- How is the sign of q, heat, defined? How does it relate to the total energy of the system?arrow_forwardThree gas-phase reactions were run in a constant-pressure piston apparatus as shown in the following illustration. For each reaction, give the balanced reaction and predict the sign of w (the work done) for the reaction. . If just the balanced reactions were given, how could you predict the sign of w for a reaction?arrow_forwardIt takes 2260 J to vaporize a gram of liquid water to steam at its normal boiling point of 100C. What is H for this process?What is the work, given that the water vaporexpands against a pressure of 0.988atm? What is U for thisprocess?arrow_forward
- 9.42 Why is enthalpy generally more useful than internal energy in the thermodynamics of real world systems?arrow_forwardCoal 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.arrow_forwardA 220-L cylinder contains an ideal gas at a pressure of 150 atm. If the gas is allowed to expand against a constant opposing pressure of 1.0 atm, how much work is done? The expansion will stop when the internal pressure equals the external pressure. Use Boyles law to determine the final volume.arrow_forward
- 9.11 Analyze the units of the quantity (pressurevolume) and show that they are energy units, consistent with the idea of PV-work.arrow_forwardWhen a gas expands, what is the sign of w? Why? When a gas contracts, what is the sign of w? Why? What are the signs of q and w for the process of boiling water?arrow_forwardDry ice is solid carbon dioxide; it vaporizes at room temperature and normal pressures to the gas. Suppose you put 21.5 g of dry ice in a vessel fitted with a piston (similar to the one in Figure 6.9 but with the weight replaced by the atmosphere), and it vaporizes completely to the gas, pushing the piston upward until its pressure and temperature equal those of the surrounding atmosphere at 24.0C and 751 mmHg. Calculate the work done by the gas in expanding against the atmosphere. Neglect the volume of the solid carbon dioxide, which is very small in comparison to the volume of the gas phase.arrow_forward
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