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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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
Calculate the change of the entropy of the system in J/K for the following phase transition: condensation of 64.1 g methanol The molar mass of methanol (CH3OH) is 32.04 g/mo%; the enthalpy of vaporization of methanol is 37.6 kJ/mol; the boiling point of methanol is 64.7°C A) -3640 B) -1130 C) 1.13446677 D) -223 E) 0.22258
Determine the values of AH', AS'and AG'for the following two reactions at 25 °C, using the data given in the table. Indicate if each of reactions is spontaneous or not Substance AH; (KJ'mol) S° (JKmo) AG; (kJ'mol) H-(g) 131 N2(g) 192 NH; (g) -46 193 -17 so,(g) -396 257 -371 H,0(1) -286 70 -237 H,SO, (aq) -909 20 -745 3 H2(g) + N, (g) - 2 NH3(g) b. So;(9) + H,0(1) - H,SO, (aq)
QUESTION 12 Which of the following is false about the second law of thermodynamics? O It is not possible to construct a perpetual motion machine which can work endlessly without the expenditure of energy. O It is impossible to transfer heat from a heat source to a hotter body without doing some work. O t is not possible to take heat from a source and convert all of it into work without losing some of it to a colder reservoir. O The entropy fo the universe is always increasing.
. Find AH, AS, and AG. Is this reaction exothermic and is it spontaneous? NO (g) + ½ 02 (g) -> NO2 (g) Given: NO(g) ½ O2 (g) NO2 (g) -> AS° J/K mol: AH° kJ/mol: 211 205.0 240.5 + 90 0. +34
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
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?
Hydrogen bromide dissociates into its gaseous elements, H2 and Br2, at elevated temperatures. AH;, kJ/mol S°, J/(mol·K) HBr(g) -36.44 198.6 H2 (9) 130.6 Br2 (g) 30.91 245.3 a. Calculate the percent dissociation at 395°C and 1.00 atm. (Enter your answer to three significant figures.) Percent dissociation =| b. What would be the percent dissociation at 395°C and 10.0 atm? (Enter your answer to three significant figures.) Percent dissociation =| c. Use data above and any reasonable approximation to obtain K. (Enter your answer to three significant figures.) K =
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