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Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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For each process predict the sign of the entropy change taking place.
A. Solid sugar is added to water to form a solution
B. Iodine vapor condenses on a cold surface to form crystals
C. N2(g) + 3H2(g) → 2NH3(g)
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- Which of the following definitions correlate to the term nonspontaneous process? O Change in entropy for a reaction calculated using the standard entropies Process that takes place without a continuous input of energy from an external source Possible configuration or arrangement of matter and energy within a system O Process that requires continual input of energy from an external sourcearrow_forwardThe normal freezing point of CCl4 is -23 °C. When CC 4 melts at -23 °C and 1 atm. pressure, the entropy change in the universe will be AS universe > 0 AS universe <0 AS universe = 0arrow_forwardA hot rock ejected from a volcano’s lava fountain cools from 1100C to 40.0C, and its entropy decreases by 950 J/K. How much heat transfer occurs from the rock?arrow_forward
- If a reaction does not move forward and backward (meaning only move to one direction; could be product favored, could be reactant favored under these conditions), what is true about entropy and enthalpy? a. ΔH°rxn < 0 and ΔS°rxn > 0. b. ΔH°rxn < 0 and ΔS°rxn < 0. c. ΔH°rxn > 0 and ΔS°rxn < 0. d. ΔH°rxn > 0 and ΔS°rxn > 0. e. both a and c are correctarrow_forwardAt what temperature will the following reaction become spontaneous?3CO2(g) + 3H2O(l) ® CH3COCH3(g) + 4O2(g) DH = 854.00 kJ/mol and DS = 236.00 J/mol*K 3128. �C 3619. �C 1090. �C 3345. �Carrow_forwardConsider the combustion of propane gas: C3H8(g) + 5O2(g) ------> 3CO2(g) + 4H2O(g) ΔHrxn = - 2044 kJ Determine the sign of the entropy change for the system.arrow_forward
- What is the entropy change when 1.20 moles of CCl₂F₂ condenses at 25.0 °C? [∆H(vap) = 17.2 kJ/mol at 25.0 °C]?arrow_forward1arrow_forward3. What change will increase the entropy of the system? Group of answer choices liquid to solid solid to gas gas to liquid gas to solid 2.ΔSsyst>0 for the following reaction: Group of answer choices A, 2NO (g) + O2(g) → 2NO2(g) B, HCl (g) + NH3(g) → NH4Cl (s) C, C3H8(g) + 5 O2(g) → 3CO2 (g) + 4 H2O (g) D, 2N2 (g) + 3H2(g) → 2NH3(g) E, Pb2+(aq) + 2Cl-(aq) → PbCl2 (s)arrow_forward
- 32. The enthalpy and entropy of vaporization of ethanol are 38.6 kJ/mol and 109.8 J/mol · K, respectively. What is the boiling point of ethanol, in °C?a. 352°Cb. 78.5°Cc. 2.84°Cd. 624°Ce. Not enough information is given to answer the questionarrow_forward3. Determine the temperature (°C) range, in which the following reaction will become spontaneous. (temperatures greater, less than or equal to the given value) Fe2O3(s) + 2Al(s) → 2Fe(s) + Al203(s) AHxn = -851.5 kJ/mol ASpen = -375.2 J/mol K %3Darrow_forward20. The standard enthalpy of vaporization of methanol is 35.2 kJ/mol at its normal boiling point, 64.6°C. What is the standard change in entropy for the vaporization of methanol at its normal boiling point? A. 104 J/(mol· K) B. 35.2 J/(mol· K) C. 0.544 J/(mol· K) D. 544 J/(mol· K) E. 0.104 J/(mol· K)arrow_forward
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