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- Which of the following reactions would have the most positive AS° value? A) SO,(g) + Na¸O(s) Na SO,(s) B) CO,(s) → CO,(g) C) Fe®*(aq) + SCN(aq) FESCN²"(aq) D) N,(g) + 3 H,(g) 2 NH,(g) E) 2 NO(g) + CI,(g) 2 NOCI(g)A reaction has AS>0 and AH>0. Which statement about this reaction must be correct? (A) If carried out in a well-insulated flask, the temperature of the reaction mixture will decrease. (B) It will occur spontancously at 298 K and 1 atm pressure. (C) As the temperature is raised, Keq for this reaction decreases. (D) The reaction has more moles of products than it has moles of reactants.When ethanol (CH;CH;OH) burns in oxygen, carbon dioxide and water are formed. (i) Write the equation which describes this reaction. (ii) Using the data below, calculate the value for AH° for the combustion of ethanol. AH; (CH;CH2OH(1)) = - 277.0 kJmol1 AH, (CO2(g)) = - 393.7 kJmol1 AH: (H2O()) = - 285.9 kJmol1
- Gibbs free energy (G) is a measure of the spontaneity of a chemical reaction. It is the chemical potential for a reaction, and is minimized at equilibrium. It is defined as G=H-TS where H is enthalpy, T is temperature, and S is entropy. The chemical reaction that causes iron to corrode in air is given by 4Fe +302-2Fe2O3 in which at 298 K, AH = - 1684 kJ and ASixn - 543.7 J/K. = Part C At what temperature Teq do the forward and reverse corrosion reactions occur in equilibrium? Express your answer as an integer and include the appropriate units. ► View Available Hint(s) Teq = Submit 14 μÅ Value Units ?(d) onlyCalculate AH for the reaction, N2H4(1) + O2(g) -----> N2(g) + 2H2O(1), from the following data: 2NH3(g) = 3N20(g) -----> 4N2(g) + 3H2O(1) N20(g) = 3H2(g) 2NH3(g0 + 1/2O2(g) -----> N2H4(1) + H2O(1) H2(g) + 1/2O2(g) AH = -1010 KJ -----> N2H4(1) + H2O(1) AH = -317 KJ AH = -143 KJ %3D -----> H2O(1) AH = -286 KJ
- In the following three instances, which choice is greener ina chemical process? Explain. (a) A reaction that can be runat 350 K for 12 h without a catalyst or one that can be run at300 K for 1 h with a reusable catalyst. (b) A reagent for thereaction that can be obtained from corn husks or one thatis obtained from petroleum. (c) A process that produces noby-products or one in which the by-products are recycledfor another process.Ka of HNO2 in 25 degree is 4.5 x 10^-4. (a) Write the equilibrium chemical reaction corresponding to Ka for nitrous acid (HNO2) at 25°C. (b) Calculate ΔG° for the dissociation of nitrous acid in solution using the given Ka value. (c) What is the value of ΔG at equilibrium? (d) When [H+] = 5.0 × 10^-2 M, [NO2^-] = 6.0 × 10^-4 M, [HNO2] = 0.20 M, what is the value of ΔG?Hydrogen peroxide can be prepared in several ways. One method is the reaction between hydrogen and oxygen, another method is the reaction between water and oxygen. Calculate the AGxn of each reaction using values from the table of thermodynamic properties. (1) H,(g) +0,(g) =H,0,1) AGan = kJ-mol- (2) H,O() + 0,(g) 2H,0,(1) kJ-mol AGn = Which method requires less energy under standard conditions? O reaction (1) reaction (2) Calculate the standard change in Gibbs free energy for the reaction at 25 °C. Refer to the AG, values. 3H,(g) + Fe,0,(s) – - 2 Fe(s) + 3 H,0(g) AG°an = kJ
- (a) The equilibrium constant of the isomerization of cis-2-butene to trans-2-butene is 2.07 at 127.0 °C. Determine the standard molar Gibbs free energy, AGR º for the reaction. (b) For C6o, the standard molar Gibbs free energy (AG, º) of formation from the elemental carbon is 23.98 kJ/mol at 25.0 °C. Determine the equilibrium constant, Keq for the formation of C60.Calculate the equilibrium constant, K, for the following reaction at 298.15 K. 3NO2(9) + H20(1) = NO(g) + 2HNO3(1) Given the followving information: AG; (NO2(9)) = 52.0 kJ/mol AG (H,0(1)) = –237.1 kJ/mol %3D AGG (NO(9)) = 87.0 kJ/mol AG (HNO,(1)) = -81.2 kJ/mol %3DA chemical engineer wants to determine the feasibility of making ethanol (CHOH) by reacting water with ethylene (C;H.) according to the equation C;Ha(g) + H;0 7. CHOH() Is this reaction spontaneous under standard conditions? Use the following data: AG CH;OH(1)=-175 kJ mole: AG fH;O(1) = -237 kJ; AG(CH.(g)) = 68 kJ/mole