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Thermodynamics, Statistical Thermodynamics, & Kinetics
- Calculate the standard Gibbs free-energy change when SO3 forms from SO2 and O2 at 298 K. Why is sulfur trioxide an important substance to study? (Hint: What happens when it combines with water?)arrow_forwardWhat is the sign of the standard Gibbs free-energy change at low temperatures and at high temperatures for the synthesis of ammonia? 3H2(g) + N2(g) 2NH3(g)arrow_forwardDetermine the standard Gibbs free energy change, rG, for the reactions of liquid methanol, of CO(g), and ofethyne, C2H2(g), with oxygen gas to form gaseous carbondioxide and (if hydrogen is present) liquid water at298 K. Use your calculations to decide which of thesesubstances are kinetically stable and which are thermodynamically stable: CH3OH(), CO(g), C2H9(g), CO2(g),H2O().arrow_forward
- From data in Appendix J, estimate (a) the boiling point of titanium(IV) chloride. (b) the boiling point of carbon disulfide, CS2, which is a liquid at 25 C and 1 bar.arrow_forwardWhat is the sign of the standard Gibbs free-energy change at low temperatures and at high temperatures for the combustion of acetaldehyde? CH3CHO(l)+52O2(g)2CO2+2H2O(l)arrow_forwardUse the data in Appendix J to calculate rG andKPat 25 C for the reaction 2HBr(g)+Cl2(g)2HCl(g)+Br2() Comment on the connection between the sign of rG and the magnitude ofKP.arrow_forward
- What determines Ssurr for a process? To calculate Ssurr at constant pressure and temperature, we use the following equation: Ssurr = H/T. Why does a minus sign appear in the equation, and why is Ssurr inversely proportional to temperature?arrow_forwardThe standard molar entropy of methanol vapor, CH3OH(g), is 239.8 J K1 mol-1. (a) Calculate the entropy change for the vaporization of 1 mol methanol (use data from Table 16.1 or Appendix J). (b) Calculate the enthalpy of vaporization of methanol, assuming that rS doesnt depend on temperature and taking the boiling point of methanol to be 64.6C.arrow_forwardCalculate the value of ΔE and ΔH on heating 64.0 g of oxygen from 0 degree celcious to 100 degree celcious. Cv and Cp on an average are 5.0 and 7.0 cal mol–1 degree–1.arrow_forward
- The diagram below shows the variation of the Gibbs free energy with temperature, T, for some process. Identify the FALSE statement: ↑ AG 0 T→ AH° 0 for this process. AH° = TAS at a certain temperature. The process is spontaneous at high temperatures. OAS> 0 for this process. AG is positive for T < 0 Karrow_forwardWhat is the type of entropy change for 2 H2 (g) + O2 (g) —> 2 H2O (l)? Provide Description.arrow_forwardThe vaporization of methanol CH:OH(I) = CH:OH(g) is an endothermic process in which AHvap = 37.4 kJ/mol and in which entropy increases, ASvap = 111 J/mol·K. Calculate the boiling point of methanol (in °C) on a mountaintop where the atmospheric pressure is 385 torr. (Assume AH° and AS° do not change appreciably with temperature). 5161 °C 1 3 4 6. C 7 8 9 +/- х 100 +arrow_forward
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