Practice ProblemATTEMPT
Calculate the standard entropy change for the following reactions at
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Chemistry
- Using the standard molar entropies in Appendix C, calculatethe standard entropy change, ΔS°, for the “water-splitting”reaction at 298 K:2 H2O(l)---->2 H2(g) + O2(g) (a) 326.3 J/K (b) 265.7 J/K (c) 163.2 J/K (d) 88.5 J/K(e) -326.3 J/Karrow_forwardDo te the entropy change that occurs in the system when 56.2g of liquid hexane (86.17 g/mol) boils at its normal boiling point of 68.7°C. The enthaloy of vaporization for hexane is 3156 k/mol. (18) (A) (B) (C) (D) (E) 60.2 J/K 0.300 J/K 2.06 x 10 J/K 92.3 J/K 20.6 J/Karrow_forwardConsider the reaction: KCIO4(s) →KCI(s) + 202(g) and the table of values given on the right. Do you expect this reaction to be spontaneous at room temperature? Why? (A) Yes, because AGrxn is negative. (B) Yes, because Hrxn is negative. (C) Yes, because AHrxn is positive. (D) No, because AGrxn is positive. (E) No, because Hrxn is positive. Substance AG fº (kJ/mol) KCIO4(s) -300.4 KCI(s) -408.2 02(8) 0 ΔΗ,° (kJ/mol) -433 -437 0arrow_forward
- Calculate ΔS°298 for the following changes.(a) SnCl4(l) ⟶ SnCl4(g)(b) CS2(g) ⟶ CS2(l)(c) Cu(s) ⟶ Cu(g)(d) H2 O(l) ⟶ H2 O(g)(e) 2H2(g) + O2(g) ⟶ 2H2 O(l)(f) 2HCl(g) + Pb(s) ⟶ PbCl2(s) + H2(g)(g) Zn(s) + CuSO4(s) ⟶ Cu(s) + ZnSO4(s)arrow_forwardFor which reaction will ΔS be positive? Group of answer choices N2O4(g) ⟶ 2 NO2(g) 2 H2(g) + O2(g) ⟶2 H2O(g) 3 NO(g) ⟶NO2(g) + N2O(g) 2 SO2(g) + O2(g) ⟶2 SO3(g)arrow_forwardQUESTION 22 At what temperature, in Kelvin, does the following reaction change from spontaneous to non-spontaneous 2 A (aq) + 2 B (aq) 2 C (aq) + 1 D (aq) if AH° (A)= 0.8219 kJ/mol, AH° (B) = -40.5308 kJ/mol, AH° (C) = -85.3178 kJ/mol, and AH (D) = -70 8643 kJ/mol AS (A)= 76.117 J/(mol K), AS (B) = -15.8072 J/(mol K), AS (C) = 18.4425 J/(mol K), and AS" (D) = -8.6387 J/(mol K)arrow_forward
- 10:59 1 Question 13 of 20 Submit Which of the following sets of conditions is true for an exothermic reaction that is spontaneous at all temperatures? A) AH 0, AS 0 D) AH > 0, AS 0, ΔG <0arrow_forwardWithout doing any calculations, predict the sign of ΔH foreach of the following reactions:(a) NaCl(s)---->Na+ (g) + Cl-(g)(b) 2 H(g)---->H2(g)(c) Na(g)---->Na+ (g) + e-(d) I2(s)---->I2(l)arrow_forwardIn which process is ΔH > 0 at constant pressure? CH3OH(g) à CH3OH(l) H3O+(aq) à H2O(l) + H+(aq) 2 NO2(g) à N2O4(g)arrow_forward
- Predict the sign of the entropy change for the following processes. Indicate the reason for each of your predictions.(a) One mole liquid water at room temperature ⟶ one mole liquid water at 50 °C(b) Ag+(aq) + Cl−(aq) ⟶ AgCl(s)(c) C6 H6(l) + (15)/(2) O2(g) ⟶ 6CO2(g) + 3H2 O(l)(d) NH3(s) ⟶ NH3(l)arrow_forward17) Predict the sign of the entropy change for the following processes. Give a reason for your prediction. (a) Na+(aq)+Cl−(aq)⟶NaCl(s)Na+(aq)+Cl−(aq)⟶NaCl(s) (b) 2Fe(s)+32O2(g)⟶Fe2O2(s)2Fe(s)+32O2(g)⟶Fe2O2(s) (c) 2C6H14(l)+19O2(g)⟶14H2O(g)+12CO2(g)arrow_forwardFind ΔG° for the following reaction using ΔH°f and S° values. (a) H2(g) + I2(s) ⟶ 2HI(g) =____kJarrow_forward
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