Based on the AHand AS values for a given chemical reaction, it is possible to predict whether the reaction is spontaneous or not at various temperatures. Which one of the following statements has the most correct answers? (A) If AH and AS are both positive, the reaction will always be spontaneous (B) If AH and AS are both positive, the reaction will be spontaneous at a high enough temperature (C) If AH is negative and AS is positive, the reaction will always be spontaneous (D) If AH and AS are both negative, the reaction will always be spontaneous (E) Both (B) and (C)

Based on the AHand AS values for a given chemical reaction, it is possible to predict whether the reaction is spontaneous or not at various temperatures. Which one of the following statements has the most correct answers? (A) If AH and AS are both positive, the reaction will always be spontaneous (B) If AH and AS are both positive, the reaction will be spontaneous at a high enough temperature (C) If AH is negative and AS is positive, the reaction will always be spontaneous (D) If AH and AS are both negative, the reaction will always be spontaneous (E) Both (B) and (C)

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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8) Calculate AG for a reaction at -12 ° C if AH is -34.6 kJ and AS is -114 J/K. Is the reaction spontaneous?
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Be sure to answer all parts. For the gaseous reaction of carbon monoxide and chlorine to form phosgene (COCl₂), perform the following calculations. (a) Calculate the AS at 298 K (AH° = −220. kJ/mol and AG° = −206 kJ/mol). kJ/mol K (b) Assuming that AS and AH change little with temperature, calculate AG at 450. K. kJ/mol
5-For the reaction, A+B C, AH-+30 kJ; AS°=+50 J/K.Therefore the reaction is: (a) spontaneous at all temperatures. (b) nonspontaneous at all temperatures. (d) irreversible at all temperatures (c) reversible at all temperatures 6- How much heat is necessary to convert 2mol of water at( 50°C) to steam at 150°C?The molar heat capacity of liquid water and steam are 75.3 J/mol. K and 36.4 J/mol. K respectively. The heat of vaporization 40.7 KJ/mol. a-81400J 7- From the reactions: b-82.337KJ c-753J d-3641 e- none of them Cgraphia +2H2(g) → CHA(R) AH = -79.9KJ C(graphia + 2Cl2(g) → CCla AH = -139KJ H 20 + Cl₂00) → HCL) AH-92.3KJ 202) calculate AH, for the reaction CH ACE +4Cl2) a- (-615.1KJ) c-(-428.3KJ) 4HCI+CCI b-(-311.2KJ) d- none of them
(a) Calculate AS° for the reaction of Na(s) and Cl2(g) to form NaCI(s). ( S°for Na (s), Cl2(g) and NaCl(s) are 51.3, 223.0, and 72.1 J/mol.K respectively) (b) Explain why this reaction takes place given your answer to part (a).
For the reaction depicted in the molecular scenes, X is redand Y is green.(a) Write a balanced equation. (b) Determine the sign of ΔS. (c) Which species has the highest molar entropy?
c) SO d) CO 0. Sodium reacts violently with water according to the equation: 2 Na(s) +2 H;0() 2 NaOH(aq) + H:(g) resulting solution has a higher temperature than the water prior to the addition of sodium. What are the signs of AH and AS for this reaction? a) AH is negative and AS is negative. b) AH is negative and AS is positive. e) AH is positive and AS is negative. d) AH is positive and AS is positive. (END)
Be sure to answer all parts. From the following combinations of AH and AS, predict if a process will be spontaneous at a high or low temperature: (a) both AH and AS are negative Process is spontaneous at high and low temperatures. Process is spontaneous at high temperatures and nonspontaneous at low temperatures. Process is nonspontaneous at high and low temperatures. Process is nonspontaneous at high temperatures and spontaneous at low temperatures. (b) AH is negative and AS is positive Process is spontaneous at high and low temperatures. Process is spontaneous at high temperatures and nonspontaneous at low temperatures. Process is nonspontaneous at high and low temperatures. Process is nonspontaneous at high temperatures and spontaneous at low temperatures. (c) both AH and AS are positive Process is spontaneous at high and low temperatures. Process is spontaneous at high temperatures and nonspontaneous at low temperatures. Process is nonspontaneous at high and low temperatures.…
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 Bra(9) 30.91 245.3 a. Calculate the percent dissociation at 337°C and 1.00 atm. (Enter your answer to three significant figures.) Percent dissociation % b. What would be the percent dissociation at 337°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