The enthalpy of vaporization of ethanol is 38.7 kJ/ mol at its boiling point (78oC). Determine ΔSsys, ΔSsurr, and ΔSuniv when 1.00 mole of ethanol is vaporized at 78oC and 1.00 atm.
Answer to relevant QuestionsFor ammonia (NH3) the enthalpy of fusion is 5.65 kJ/ mol, and the entropy of fusion is 28.9 J K-1 mol-1. a. Will NH3(s) spontaneously melt at 200. K? b. What is the approximate melting point of ammonia? Of the functions ΔHo, ΔSo, and ΔGo, which depends most strongly on temperature? When ΔGo is calculated at temperatures other than 25oC, what assumptions are generally made concerning ΔHo and ΔSo? For the reaction 2O(g) → O2(g) a. Predict the signs of ΔH and ΔS. b. Would the reaction be more spontaneous at high or low temperatures? One of the reactions that destroys ozone in the upper atmosphere is NO(g) + O3(g) ⇌ NO2(g) + O2(g) Using data from Appendix 4, calculate ΔGo and K (at 298 K) for this reaction. For the reaction A(g) + 2B(g) ⇌ C(g) the initial partial pressures of gases A, B, and C are all 0.100 atm. Once equilibrium has been established, it is found that [C] = 0.040 atm. What is ΔGo for this reaction at 25oC?
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