Given the following values, calculate the temperature at which the process will transition between spontaneous and non- spontaneous. AH° 108.8 kJ /mol %3! AS° = 263.8 J/K-mol Important: In your answer, include: • numbers only (no units) no spaces or commas • no decimal places (to the units column, don't worry about sig. figs.) Examples: 140 and 2192 (a comma will automatically be entered for you if your answer is 2 1000) The process will transition between spontaneous and non- spontaneous at a Kelvin temperature of:

Given the following values, calculate the temperature at which the process will transition between spontaneous and non- spontaneous. AH° 108.8 kJ /mol %3! AS° = 263.8 J/K-mol Important: In your answer, include: • numbers only (no units) no spaces or commas • no decimal places (to the units column, don't worry about sig. figs.) Examples: 140 and 2192 (a comma will automatically be entered for you if your answer is 2 1000) The process will transition between spontaneous and non- spontaneous at a Kelvin temperature of:

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

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Determine the universe entropy change ΔS° (universe) in J/K (with 4 significant figures) for the reaction below at 298.15 K. Note that the temperature of surroundings is also 298.15 K. I2(s) + 3Cl2 (g) → 2 ICl3 (s) The standard entropy change and enthalpy change of the reaction (from the system) are given below: ΔS° (reaction) = -450.33 J/K and ΔH° (reaction) = -179.16 kJ
Consider the following reaction occurring at 25C Nitrogen monoxide gas reacts with hydrogen gas to form ammonia gas and water vapor (steam) Use Appendix 2 to obtain-the data required to find the following: (fill in the blanks with a numerical response only. Do not write the units in your answer.) 1. Enthalpy of reaction: AH kJ/mol %3D 2. Entropy of system: AS J/mol 3. Entropy of surroundings: AS. J/mol surr 4. Entropy of universe: ASM J/mol %3D univ 5. Use the enthalpic and entropic data calculated above, calculate the free energy of the system, AGn kJ/mol %3D I 6. Is the reaction spontaneous? Answer Yes or No
For a particular reaction, AH is 20.1 kJ/mol and AS is 45.9 J/(mol-K). Assuming these values change very little with temperature, over what temperature range is the reaction spontaneous in the forward direction (i.e., product favored)? The reaction is spontaneous (product favored) for temperatures O greater than O less than T = Chp
At 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. �C
Nn.78. Subject :- Chemistry
For a particular reaction, AH° = -93.8 kJ and AS° = –156.1 J/K. Assuming these values change very little with temperature, at what temperature does the reaction change from nonspontaneous to spontaneous? T = K Is the reaction in the forward direction spontaneous at temperatures greater than or less than the calculated temperature? less than greater than
2 NH3 (g) + 2 O2 (g) → N20 (g) + 3 H2O (g) Is this reaction spontaneous only at low temperatures, only at high temperatures, at all temperatures? AH°r, kJ/mol s°, J/mol·K NH3(g) -46.1 192.5 0:(g) 205.0 N 20 (g) 82.1 219.9 H2O(g) |-241.8 188.7 AH°i, kJ/mol s°, J/mol·K What is the lowest temperature at which the following reaction is spontaneous? H2O (g) + C (s) → H2 (g) + CO (g) Co(g) H2(g) C (s) -110.5 | 197.7 130.6 5.7 H2O(g) |-241.8 188.7
Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) of the reaction enthalpy AH and reaction entropy AS. Note: if you have not been given enough information to decide a sign, select the "unknown" option. reaction A C observations This reaction is slower below 18. °C than above. This reaction is spontaneous only above 97. °C. This reaction is always spontaneous, but proceeds faster at temperatures above 72. °C. AH is AS is conclusions AH is AS is AH is AS is ✓ (pick one) positive negative unknown (pick one) (pick one) (pick one) (pick one)
59. Methanol (CH3OH) burns in oxygen to form carbon dioxide and water. Write a balanced equation for the combustion of liq- uid methanol and calculate AHan, ASs and AG at 25 C. Is the combustion of methanol spontaneous?
Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) of the reaction enthalpy AH and reaction entropy AS. Note: if you have not been given enough information to decide a sign, select the "unknown" option. reaction A B с observations Crystallization of a pure compound is spontaneous only below 23. °C. This reaction is spontaneous only above 31. °C but proceeds at a faster rate above 83. °C. The reverse of this reaction is always spontaneous but proceeds faster at temperatures above 108. °C. AH is AS is AH is AS is conclusions ΔΗ is AS is (pick one) (pick one) (pick one) (pick one) (pick one) (pick one) V
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