Chemistry: Structure and Properties (2nd Edition)
2nd Edition
ISBN: 9780134293936
Author: Nivaldo J. Tro
Publisher: PEARSON
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Chapter 18, Problem 32E
Interpretation Introduction
To determine:
Change in entropy
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Chapter 18 Solutions
Chemistry: Structure and Properties (2nd Edition)
Ch. 18 - What is the first law of thermodynamics, and how...Ch. 18 - What is nature’s heat tax, and how does it relate...Ch. 18 - What is a perpetual motion machine? Can such a...Ch. 18 - Is it more efficient to heat your home with a...Ch. 18 - What is a spontaneous process? Provide an example.Ch. 18 - Explain the difference between the spontaneity of...Ch. 18 - What is the precise definition of entropy? What is...Ch. 18 - Why does the entropy of a gas increase when it...Ch. 18 - Explain the difference between macrostates and...Ch. 18 - Based on its fundamental definition, explain why...
Ch. 18 - State the second law of thermodynamics. How does...Ch. 18 - What happens to the entropy of a sample of matter...Ch. 18 - Explain why water spontaneously freezes to form...Ch. 18 - Why do exothermic processes tend to be spontaneous...Ch. 18 - What is the significance of the change in Gibbs...Ch. 18 - Predict the spontaneity of a reaction (and the...Ch. 18 - State the third law of thermodynamics and explain...Ch. 18 - Why is the standard entropy of a substance in the...Ch. 18 - How does the standard entropy of a substance...Ch. 18 - How can you calculate the standard entropy change...Ch. 18 - Describe the three different methods to calculate...Ch. 18 - Why is free energy “free”?Ch. 18 - Explain the difference between G and G .Ch. 18 - Why does water spilled on the floor evaporate even...Ch. 18 - How do you calculate the change ¡n free energy for...Ch. 18 - How does the value of G for a reaction relate to...Ch. 18 - Prob. 27ECh. 18 - Prob. 28ECh. 18 - Prob. 29ECh. 18 - Prob. 30ECh. 18 - Calculate the change in entropy that occurs in the...Ch. 18 - Prob. 32ECh. 18 - Calculate the change ¡n entropy that occurs in the...Ch. 18 - Prob. 34ECh. 18 - Without doing any calculations, determine the sign...Ch. 18 - Prob. 36ECh. 18 - Without doing any calculations, determine the sign...Ch. 18 - Prob. 38ECh. 18 - Calculate Ssurr at the indicated temperature for...Ch. 18 - Prob. 40ECh. 18 - Given the values of Hrxn , Srxn and T, determine...Ch. 18 - Prob. 42ECh. 18 - Prob. 43ECh. 18 - Prob. 44ECh. 18 - Calculate the free energy change for the reaction...Ch. 18 - Prob. 46ECh. 18 - Prob. 47ECh. 18 - Predict the conditions (high temperature, low...Ch. 18 - How does the molar entropy of a substance change...Ch. 18 - What is the molar entropy of a pure crystal at 0...Ch. 18 - For each pair of substances, choose the one that...Ch. 18 - For each pair of substances, choose the one that...Ch. 18 - Rank each set of substances in order of increasing...Ch. 18 - Prob. 54ECh. 18 - Use data from Appendix IIB to calculate Srxn for...Ch. 18 - Use data from Appendix IIB to calculate Srxn for...Ch. 18 - Find S for the formation of CH2Cl2(g) from its...Ch. 18 - Prob. 58ECh. 18 - Methanol burns in oxygen to form carbon dioxide...Ch. 18 - In photosynthesis, plants form glucose (C6H12O6)...Ch. 18 - For each reaction, calculate Hrxn , Srxn and Grxn...Ch. 18 - For each reaction calculate Hrxn , Srxn and Grxn...Ch. 18 - Use standard free energies of formation to...Ch. 18 - Use standard free energies of formation to...Ch. 18 - Consider the reaction: 2NO(g)+O2(g)2NO2(g)...Ch. 18 - Prob. 66ECh. 18 - Determine G for the reaction:...Ch. 18 - Prob. 68ECh. 18 - Consider the sublimation of iodine at 25.0°C:...Ch. 18 - Consider the evaporation of methanol at 25.0°C....Ch. 18 - Consider the reaction: CH3OH(g)CO(g)+2H2(g)...Ch. 18 - Consider the reaction: CO2(g)+CCl4(g)2COCl2(g)...Ch. 18 - Use data from Appendix IIB to calculate the...Ch. 18 - Prob. 74ECh. 18 - Prob. 75ECh. 18 - Prob. 76ECh. 18 - Prob. 77ECh. 18 - Prob. 78ECh. 18 - Consider the reaction: H2(g)+I2(g)2HI(g) The...Ch. 18 - Consider the reaction: 2N0(g) — O(g) 2N02(g) The...Ch. 18 - The change in enthalpy (Hrxn) for a reaction is...Ch. 18 - Prob. 82ECh. 18 - Prob. 83ECh. 18 - Prob. 84ECh. 18 - Our atmosphere is composed primarily of nitrogen...Ch. 18 - Prob. 86ECh. 18 - Ethene (C2H4) can be halogenated by the reaction:...Ch. 18 - H2 reacts with the halogens (X2) according to the...Ch. 18 - Consider this reaction occurring at 298 K:...Ch. 18 - Consider this reaction occurring at 298 K:...Ch. 18 - Prob. 91ECh. 18 - Prob. 92ECh. 18 - These reactions are important in catalytic...Ch. 18 - Prob. 94ECh. 18 - All the oxides of nitrogen have positive values of...Ch. 18 - Prob. 96ECh. 18 - Consider the reaction X2(g)2X(g) . When a vessel...Ch. 18 - Prob. 98ECh. 18 - Indicate and explain the sign of Suniv for each...Ch. 18 - The Haber process is very important for...Ch. 18 - A metal salt with the formula MCl2 crystallizes...Ch. 18 - The solubility of AgCI(s) in water at 25°C is...Ch. 18 - Review the subsection in this chapter entitled...Ch. 18 - Calculate the entropy of each state and rank the...Ch. 18 - Suppose we redefine the standard state as P=2atm ....Ch. 18 - The G for the freezing of H2O(l) at 10°C is 210...Ch. 18 - Consider the reaction that occurs during the Haber...Ch. 18 - The salt ammonium nitrate can follow three modes...Ch. 18 - Given the tabulated data, calculate Svap for each...Ch. 18 - Prob. 110ECh. 18 - Prob. 111ECh. 18 - Consider the changes in the distribution of nine...Ch. 18 - Prob. 113ECh. 18 - Prob. 114ECh. 18 - Prob. 115ECh. 18 - The reaction A(g)B(g) has an equilibrium constant...Ch. 18 - Prob. 117ECh. 18 - Prob. 118ECh. 18 - Prob. 119ECh. 18 - Have each group member look up Hf and S for one...Ch. 18 - Calculate G at 25°C for the reaction in the...Ch. 18 - Prob. 122ECh. 18 - Which reaction Is most likely to have a positive...Ch. 18 - Prob. 2SAQCh. 18 - Arrange the gases—F2, Ar, and CH3F—in order of...Ch. 18 - Prob. 4SAQCh. 18 - Prob. 5SAQCh. 18 - For a certain reaction Hrxn=255kJ and Srxn=211J/K...Ch. 18 - Prob. 7SAQCh. 18 - s8. Use standard free energies of formation to...Ch. 18 - Prob. 9SAQCh. 18 - For the following reaction, Grxn=9.4kJ at 25 °C....Ch. 18 - Prob. 11SAQCh. 18 - Prob. 12SAQCh. 18 - Prob. 13SAQCh. 18 - Prob. 14SAQCh. 18 - Prob. 15SAQCh. 18 - Prob. 16SAQ
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- Solid NH4NO3 is placed in a beaker containing water at 25 C. When the solid has completely dissolved, the temperature of the solution is 23.5 C. (a) Was the process exothermic or endothermic? (b) Was the process spontaneous? (c) Did the entropy of the system increase? (d) Did the entropy of the universe increase?arrow_forwardDefine the following: a. spontaneous process b. entropy c. positional probability d. system e. surroundings f. universearrow_forwardWhat is entropy? Why is entropy important?arrow_forward
- Which contains greater entropy, a quantity of frozen benzene or the same quantity of liquid benzene at the same temperature? Explain in terms of the dispersal of energy in the substance.arrow_forwardFor each process, tell whether the entropy change of the system is positive or negative, (a) A glassblower heats glass (the system) to its softening temperature, (b) A teaspoon of sugar dissolves in a cup of coffee. (The system consists of both sugar and coffee.) (c) Calcium carbonate precipitates out of water in a cave to form stalactites and stalagmites. (Consider only the calcium carbonate to be the system.)arrow_forwardFor each process, tell whether the entropy change of the system is positive or negative. Water vapor (the system) deposits as ice crystals on a cold windowpane. A can of carbonated beverage loses its fizz. (Consider the beverage but not the can as the system. What happens to the entropy of the dissolved gas?) A glassblower heats glass (the system) to its softening temperature.arrow_forward
- Through photosynthesis, plants build molecules of sugar containing several carbon atoms from carbon dioxide. In the process, entropy is decreased. The reaction of CO2with formic acid to form oxalic acid provides a simple example of a reaction in which the number of carbon atoms in a compound increases: CO2(aq)+HCOOH(aq)H2C2O4(aq) (a) Calculate the standard entropy change for this reaction and discuss the sign of S . (b) How do plants carry out reactions that increase the number of carbon atoms in a sugar, given the changes in entropy for reactions like this?arrow_forwardThe molecular scale pictures below show snapshots of a strong acid at three different instants after it is added to water. Place the three pictures in the correct order so that they show the progress of the spontaneous process that takes place as the acid dissolves in the water. Explain your answer in terms of entropyarrow_forwardFor each process, tell whether the entropy change of the system is positive or negative. (a) A glassblower heats glass (the system) to its softening temperature. (b) A teaspoon of sugar dissolves in a cup of coffee. (The system consists of both sugar and coffee.) (c) Calcium carbonate precipitates out of water in a cave to form stalactites and stalagmites. (Consider only the calcium carbonate to be the system.)arrow_forward
- For the reaction NO(g)+NO2(g)N2O3(g) , use tabulated thermodynamic data to calculate H and S. Then use those values to answer the following questions. (a) Is this reaction spontaneous at 25°C? Explain your answer. (b) If the reaction is not spontaneous at 25°C, will it become spontaneous at higher temperatures or lower temperatures? (c) To show that your prediction is accurate, choose a temperature that corresponds to your prediction in part (b) and calculate G . (Assume that both enthalpy and entropy are independent of temperature.)arrow_forwardWhen solid sodium acetate crystallizes from a supersaturated solution, can you accurately predict the sign of H for the crystallization? Why or why not?arrow_forwardFor one day, keep a log of all the activities you undertake that consume Gibbs free energy. Distinguish betweenGibbs free energy provided by nutrient metabolism andthat provided by other energy resources.arrow_forward
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