(a)
Interpretation:
The substance between
Concept Introduction:
The term entropy is used to represent the randomness in a system. When a system moves from an ordered arrangement to a less order arrangement, then the entropy of the system increases. The second law of
(b)
Interpretation:
The substance between
Concept Introduction:
Refer to part (a).
(c)
Interpretation:
The substance between
Concept Introduction:
Refer to part (a).
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Chapter 16 Solutions
Chemistry: The Molecular Science
- Consider the reaction of 2 mol H2(g) at 25C and 1 atm with 1 mol O2(g) at the same temperature and pressure to produce liquid water at these conditions. If this reaction is run in a controlled way to generate work, what is the maximum useful work that can be obtained? How much entropy is produced in this case?arrow_forwardWhat is the sign of the standard Gibbs free-energy change at low temperatures and at high temperatures for the synthesis of ammonia? 3H2(g) + N2(g) 2NH3(g)arrow_forwardConsider the reaction of 1 mol H2(g) at 25C and 1 atm with 1 mol Br2(l) at the same temperature and pressure to produce gaseous HBr at these conditions. If this reaction is run in a controlled way to generate work, what is the maximum useful work that can be obtained? How much entropy is produced in this case?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_forwardDescribe how the standard entropy of hydrogen gas at 25C can be obtained from heat measurements.arrow_forwardDetermine the entropy change for the combustion of gaseous propane, C3H8, under the standard conditions to give gaseous carbon dioxide and water.arrow_forward
- What is the sign of the standard Gibbs free-energy change at low temperatures and at high temperatures for the combustion of acetaldehyde? CH3CHO(l)+52O2(g)2CO2+2H2O(l)arrow_forwardThe standard molar entropy of methanol vapor, CH3OH(g), is 239.8 J K1 mol-1. (a) Calculate the entropy change for the vaporization of 1 mol methanol (use data from Table 16.1 or Appendix J). (b) Calculate the enthalpy of vaporization of methanol, assuming that rS doesnt depend on temperature and taking the boiling point of methanol to be 64.6C.arrow_forwardAccording to Lambert, leaves lying in the yard and playing cards that are in disarray on a table have not undergone an increase in their thermodynamic entropy. Suggest another reason why leaves and playing cards may not be a good analogy for the entropy of a system containing, for example, only H2O molecules or only O2 molecules.arrow_forward
- The reaction N2(g)+3H2(g)2NH3(g) is spontaneous at room temperature but becomes nonspontaneous at a much higher temperature. From this fact alone, obtain the signs of H, and S, assuming that H and S do not change much with temperature. Explain your reasoningarrow_forwarda From a consideration of the following reactions, calculate Hf for ethane, C2H6(g). CH3CHO(g)+2H2(g)C2H6(g)+H2O(l);H=204kJ2H2(g)+O2(g)2H2O(g);H=484kJ2C2H5OH(l)+O2(g)2CH3CHO(g)+2H2O(l);H=348kJH2O(l)H2O(g);H(kJ)=442C2H5OH(l)4C(s)+6H2(g)+O2(g);H(kJ)=555 b From appropriate entropy data, calculate S for the formation of ethane from the elements. c Using the information from above, calculate Gf for ethane at 25C.arrow_forwardCalculate the standard entropy change for the reaction CO2(g)+2H2O(l)CH4(g)+2O2(g) . What does the sign of S say about the spontaneity of this reaction?arrow_forward
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