X. (15 pts) For the following reaction: Н Н H20 "ОН Н Н BDE (kJ/mol) bond...
X.(15 pts) For the following reaction: X + H2O OH H BDE (kl/mol) Tt bond 264 498 H-OH H-CH 435 C-OH 381 a. calculate AH for the reaction. b. what is the sign of AS? Explain. c. write the expression for AG. d. what is the sign of AG for a spontaneous reaction? e. Would the reaction be spontaneous at high or low temperature? Explain
Calculate AH for the following reaction using the given bond dissociation energies. >co,g)+2H,0(g) AH° (kJ/mol) CHg)20,g) Bond 142 О-О Н-О 459 С-Н 411 799 O O 498 С-О 358 Number ΔΗ. kJ/ mol This reaction is endothermic exothermic
1. For the following substitution reaction, please (a) calculate the AHn. (b) Is this reaction an exothermic or endothermic process? (5 pts) Bond dissociation energies CH3 CH3 Н-с-он (CH3)2CH-Br 285 kJ/mol H-OH Н-с -Br Н-Bг (CH3)2CH-OH 401 kJ/mol CH3 CH3 H-OH 498 kJ/mol 368 kJ/mol Н-Вг
AH = 44.0 kJ/mol AS = 0.119 kJ/mol K The following reaction takes place at 120°C: H20(1) - H2O(g) Which of the following must be true? Select one: O a. Two of these O b. The reaction is not spontaneous O c The reaction is spontaneous. O d. AG = 0 e. AGO
Problem of the Day 18 1. (10 pts) Consider the following reaction: TO + HBr a. Estimate AH for this reaction (use table 6.1 in your textbook) b. Is AS for this reaction positive or negative? Explain. C. Determine if AG is positive or negative. d. Is the sign of AG (positive or negative) dependent on temperature? Why? TABLE 6.1 BOND DISSOCIATION ENERGIES (AH) OF COMMON BONDS KJ/MOL KCAL/MOL KI/MOL KCAUMO Bonds to H H2C=CH-CH3 HCC-CH3 KJ/MOL KCAL/MOL 385 92...
Problem of the Day 18 1. (10 pts) Consider the following reaction: Br HBO a. Estimate AH for this reaction (use table 6.1 in your textbook) b. Is AS for this reaction positive or negative? Explain. C. Determine if AG is positive or negative. d. Is the sign of AG (positive or negative) dependent on temperature? Why? TABLE 6.1 BOND DISSOCIATION ENERGIES (AH) OF COMMON BONDS KJ/MOL KCAL/MOL KI/MOL KCAUMO Bonds to H H2C=CH-CH3 HC=C-CH3 KJ/MOL KCAL/MOL 385 92 489...
15. The standard Gibbs free energy change (AG%) for the Haber reaction at 298K is -2.83 kJ/mol N2(g) + 3H2(g) + 2NH3(g) If the reaction begins with 2.55 atm N2(g) 0.115 atm Hz(g) and 0.488 atm NH3(9) at 298K what is the free energy change (AG) for the reaction under these conditions AND will the reaction be spontaneous under these conditions? (10 points) 16. For the following reactions, predict whether they will tend to be spontaneous at either high or...
Problem #3 Calculate AH° for the following reaction using the bond energies found in Table 6.1 on page 228. Is this reaction spontaneous? (CH3)3C-H + 12 (CH3)3C-1 + HI TABLE 6.1 BOND DISSOCIATION ENERGIES (AH) OF COMMON BONDS KJ/MOL KCAL/MOL H2C=CH-CH3 HC-C-CH KJ/MOL KCAL/MOL 385 92 489117 KJ/MOL KCAL/MOL 444 106 335 80 285 Bonds to H. H-H H-CH3 H-CH2CH3 H-CH(CH3)2 H-C(CH3)3 (CH3)2CH-F (CH3)2CH-CI (CH3)2CH-Br (CH3)2CH- (CH3)2CH-OH 68 222 435 104 435 104 41098 39795 91 473 113 53 381...
1. For the following substitution reaction, please (a) calculate the AHran. (b) is this reaction an exothermic or endothermic process? (5 pts) CHE CH3 H-C-Br + H-O-H + H-Br CHE н-с-он сн. Bond dissociation energies (CH3)2CH-Br 285 kJ/mol (CH),CH-OH 401 kJ/mol H-OH 498 kJ/mol H-Br 368 kJ/mol
Which of the following best describes this dissociation reaction? (Hint: Remember that AG - AH - TAS, how does the entropy term change at different temperatures?) NH, NO3(s) + NH4 + (aq) + NO3-(aq) AH- +28.05 kJ/mol AS- +108.7J/mol*K Spontaneous at al temperatures Not spontaneous at any temperature Spontaneous at high T but not low T Spontaneous at low T but not high T