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Gibbs Free Energy Solutions Library

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440 solutions

Gibbs Free Energy

Q. Consider the following reaction:CH3OH(g ⇌ CO(g)+2H2(g)Calculate ΔG for this reaction at 25 °C under the following conditions:PCH3OH= 0.815 atmPCO= ...

Solved • Apr 13, 2021

Gibbs Free Energy

Q. Consider the following reaction:2 NO(g)+O2(g)→2 NO2(g)Estimate ΔG° for this reaction at each of the following temperatures and predict whether or n...

Solved • Apr 13, 2021

Gibbs Free Energy

Q. Use data from Appendix IIB to calculate the equilibrium constants at 25 °C for this reaction: N2(g)+3H2(g)⇌2NH3(g)

Solved • Apr 7, 2021

Gibbs Free Energy

Q. 2CO(g)+2NO(g)→2CO2(g)+N2(g). Use standard free energies of formation to determine ΔG∘rxn for this reaction at 25°C.

Solved • Apr 7, 2021

Gibbs Free Energy

Q. If a reaction is exergonic, then which of these statements is true?A. The products have lower Gibbs free energy than the reactants.B. Energy must b...

Solved • Apr 2, 2021

Gibbs Free Energy

Q. Calculate the ΔG°rxn using the following information.2 HNO3(aq) + NO(g) → 3 NO2(g) + H2O(l)   ΔG°rxn=?ΔH°f (kJ/mol) -207.0, 91.3 , 33.2,  -285.8S°(...

Solved • Apr 2, 2021

Gibbs Free Energy

Q. Consider the decomposition of a metal oxide to its elements, where M represents a generic metal.M2O3(s) ⇌ 2 M(s) + 3/2 O2(g)What is the standard ch...

Solved • Mar 30, 2021

Gibbs Free Energy

Q. 2 Ca(s)+O2(g) → 2 CaO(s) ΔH°rxn= -1269.8 kJ; ΔS°rxn= -364.6 J/K. Calculate the free energy change for the reaction at 24 °C.

Solved • Mar 30, 2021

Gibbs Free Energy

Q. Which variable is not required to calculate the gibbs free-energy change for a chemical reaction? temperature in kelvins change in entropy change i...

Solved • Mar 30, 2021

Gibbs Free Energy

Q. What is delta G?

Solved • Mar 30, 2021

Gibbs Free Energy

Q. Calculate the standard change in Gibbs free energy for the following reaction at 25 °C. 6 Cl2(g) + 2Fe2O3 (s) → 4 FeCl3(s) + 3 O2(g)

Solved • Mar 30, 2021

Gibbs Free Energy

Q. Calculate ΔG° at 298 K for the following reactions.Part ANH3(g) + HBr(g) → NH4Br(s)Part B2 KClO3(s) → 2 KCl(s) + 3 O2(g)Part CCH4(g) + 3 Cl2(g → CH...

Solved • Mar 22, 2021

Gibbs Free Energy

Q. Calculate the change in Gibbs free energy for each of the following sets of ΔH°rxn, ΔS°rxn, and T.Part 1ΔH°rxn= 88 kJ , ΔS°rxn= 154 J/K , T= 292 KE...

Solved • Mar 22, 2021

Gibbs Free Energy

Q. Calculate the standard change in Gibbs free energy for the following reaction at 25 °C. 6Cl2(g) + 2Fe2O3 (s) → 4FeCl3(s) + 3O2(g)

Solved • Feb 24, 2021

Gibbs Free Energy

Q. Consider the following three reactions. For each of the reactions, use data in Appendix C in the textbook to calculate ΔH°, ΔG°, and ΔS° at 25 °C.3...

Solved • Feb 9, 2021

Gibbs Free Energy

Q. Consider the following three reactions. For each of the reactions, use data in Appendix C in the textbook to calculate ΔH°, ΔG°, and ΔS° at 25 °C.2...

Solved • Feb 9, 2021

Gibbs Free Energy

Q. Consider the following three reactions. For each of the reactions, use data in Appendix C in the textbook to calculate ΔH°, ΔG°, and ΔS° at 25 °C.1...

Solved • Feb 5, 2021

Gibbs Free Energy

Q. Consider the freezing of liquid water at -10°C. For this process what are the signs for delta h, delta S and delta G?                         delta...

Solved • Feb 5, 2021

Gibbs Free Energy

Q. Given the following information:A+B ---> 2D Delta H= -707.5 kJ, Delta S= 338.0 J/KC ---> D Delta H= 504.0 kJ, Delta S= -244.0 J/KCalculate De...

Solved • Jan 27, 2021

Gibbs Free Energy

Q. What is the value of K for this aqueous reaction at 298 K? ΔG° = 21.29 kJ/molA + B ⇌ C + D

Solved • Nov 23, 2020

Gibbs Free Energy

Q. Given the following information determine the reaction Gibbs energy for the formation of hydrazine (N2H4) at 298 K 2NH3(g) → N2H4(l) + H2(g) NH3 : ...

Solved • Nov 23, 2020

Gibbs Free Energy

Q. How do you calculate the change in free energy for a reaction under nonstandard conditions?

Solved • Nov 17, 2020

Gibbs Free Energy

Q. Consider the following reaction 2 SO2(g) + O2(g) → 2 SO3(g)The free energies of formation at 25°C are given below:SO2 = -300 kJ/molSO3 = -371 kJ/mo...

Solved • Nov 9, 2020

Gibbs Free Energy

Q. Consider this reaction occurring at 298 K: BaCO3(s) ↔ BaO(s) + CO2(g)a. Show that the reaction is not spontaneous under standard conditions by calc...

Solved • Nov 2, 2020

Gibbs Free Energy

Q. Complete this table relating the values of ΔG° and K.

Solved • Oct 21, 2020

Gibbs Free Energy

Q. How will an increase in temperature affect ΔG?A=delt g increaseB= ΔG will increase if the mass-action ratio is greater than 1 and decrease if the m...

Solved • Oct 19, 2020

Gibbs Free Energy

Q. Part A. 2Ca(s)+O2(g) → 2CaO(s)  ΔH°rxn= -1269.8 kJ; ΔS°rxn= -364.6 J/K. Calculate the free energy change for the reaction at 24 °C.Part B. Calculat...

Solved • Oct 19, 2020

Gibbs Free Energy

Q. Calculate the boiling point of benzene (C6H6). Round to nearest degree Celsius.

Solved • Jun 16, 2020

Gibbs Free Energy

Q. Methanol (CH3OH) burns in oxygen to form carbon dioxide and water. Write a balanced equation for the combustion of liquid methanol and calculate ΔH...

Solved • Jun 15, 2020

Gibbs Free Energy

Q. Calculate the standard entropy, ΔS°rxn, of the following reaction at 25.0 °C using the data in this table. The standard enthalpy of the reaction, Δ...

Solved • Apr 30, 2020

Gibbs Free Energy

Q. Which of the following is true for pure oxygen gas, O2(g) at 25°C?A) ΔH°f > 0B) ΔH°f < 0C) ΔG°f > 0D) ΔG°f < 0E) ΔS° > 0

Solved • Apr 30, 2020

Gibbs Free Energy

Q. What is the standard Gibbs free energy of formation, ΔG°f, of NH3(g) at 298 K?

Solved • Apr 29, 2020

Gibbs Free Energy

Q. The value of Ka for nitrous acid (HNO2) at 25 °C is 4.5×10−4.a. Write the chemical equation for the equilibrium that corresponds to Ka1. H+(aq) + N...

Solved • Apr 29, 2020

Gibbs Free Energy

Q. Given the following informationA + B → 2D             ΔH° = -686.8 kJ                ΔS° = 352.0 J/KC → D                      ΔH° = 553.0 kJ      ...

Solved • Apr 27, 2020

Gibbs Free Energy

Q. Carbon monoxide (CO) is toxic because it binds more strongly to the iron in hemoglobin (Hb) than does oxygen (O2), as indicated by these approximat...

Solved • Apr 27, 2020

Gibbs Free Energy

Q. Consider the following reaction:CH3OH(g) ⇌ CO(g) + 2H2(g)Calculate ΔG for this reaction at 25 °C under the following conditions:PCH3OH = 0.815 atmP...

Solved • Apr 23, 2020

Gibbs Free Energy

Q. In photosynthesis, plants form glucose (C6H12O6) and oxygen from carbon dioxide and water.a). Calculate ΔH°rxn at 15 °C.b). Calculate ΔS°rxn at 15 ...

Solved • Apr 23, 2020

Gibbs Free Energy

Q. For a  particular reaction, ΔH = -144.6 KJ and ΔS = -301.2 J/KCalculate the ΔG for this reaction at 298k1) ΔG in KJ?2) What can be said about the s...

Solved • Apr 21, 2020

Gibbs Free Energy

Q. The following equation represents the decomposition of a generic diatomic element in its standard state.  1/2x^2 (g) yields X(g)assume that the sta...

Solved • Apr 21, 2020

Gibbs Free Energy

Q. A reaction has a standard free-energy change of -13.50 KJ mol-1 (-3.227 kcal mol-1). Calculate the equilibrium constant for the reaction at 25 degr...

Solved • Apr 15, 2020

Gibbs Free Energy

Q. Use the equilibrium constant to calculate delta G (in kJ) at 298 K for the following reaction:2HCl (g) ↔  H2 (g) + Cl2 (g) K= 3.89 x 10-34 at 298 K.

Solved • Apr 14, 2020

Gibbs Free Energy

Q. Calculate K at 298 K for the following reaction: NO(g) + 1/2 O2 (g) ⇌ NO2(g) ΔG (kJ/mol) for the following: NO(g) 86.60, NO2(g) 51, O2(g) 0 (answer...

Solved • Apr 14, 2020

Gibbs Free Energy

Q. What is true if ln K is 1?A. ΔG°rxn is positive and the reaction is spontaneous in the reverse direction.B. ΔG°rxn is positive and the reaction is ...

Solved • Apr 14, 2020

Gibbs Free Energy

Q. When the oxide of generic metal M is heated at 25C, only a negligible amount of M is produced.MO2(s) ↔  M(s)+O2(g)delta G = 288.5 kJ/molWhen the re...

Solved • Apr 14, 2020

Gibbs Free Energy

Q. Consider the following Gibbs energies at 25 °C.Substance                           ΔG°f (kJ•mol-1Ag+(aq)                                    77.1Cl-...

Solved • Apr 13, 2020

Gibbs Free Energy

Q. Consider the following Gibbs energies at 25 °C.Substance                           ΔG°f (kJ•mol-1)Ag+(aq)                                    77.1Cl...

Solved • Apr 13, 2020

Gibbs Free Energy

Q. A particular reaction has ΔG = –350 kJ and ΔS = –350J/K.How much heat cannot be converted to work?

Solved • Apr 9, 2020

Gibbs Free Energy

Q. How will an increase in temperature affect ΔG?A) ΔG will decrease if the mass-action ratio is greater than 1 and increase if the mass-action ratio ...

Solved • Mar 31, 2020

Gibbs Free Energy

Q. For the reaction given below, the standard change in free energy has a positive value.A+B<-->C+DChanging the conditions of the reaction can a...

Solved • Mar 31, 2020

Gibbs Free Energy

Q. Use data from appendix iib in the textbook to calculate the equilibrium constants at 25°C for each of the following reaction:2 H2S (g) ⇌ 2 H2(g) + ...

Solved • Mar 25, 2020

Gibbs Free Energy

Q. Use data from appendix iib in the textbook to calculate the equilibrium constants at 25 degrees Celsius for each of the following reaction: 2 CO (g...

Solved • Mar 25, 2020

Gibbs Free Energy

Q. For the following battery Cd(s) | CdCl2(aq) || Cl- (aq) | Cl2(l)| C(s) (a) Write the reduction half-reaction occuring at the C(s) electrode (Includ...

Solved • Mar 25, 2020

Gibbs Free Energy

Q. If the value of the equilibrium constant, K, for a reaction is greater than 1, the value of ΔG for the reaction is________- and the reaction is____...

Solved • Mar 23, 2020

Gibbs Free Energy

Q. The reactionSO2(g) + 2H2S(g) ⇋ 3S (s) + 2H2O(g) is the basis of a suggested method for removal of SO2, a pollutant that irritates airways causing c...

Solved • Mar 20, 2020

Gibbs Free Energy

Q. What are the signs of ΔS, ΔH, and ΔG for the formation of dew on a cool night?a) + ΔS, + ΔH, + ΔGb) + ΔS, + ΔH, - ΔGc) + ΔS, - ΔH, + ΔGd) + ΔS, - Δ...

Solved • Mar 20, 2020

Gibbs Free Energy

Q. The reactionSO2(g)+2H2S(g) ⇌ 3 S(s)+2H2O(g)is the basis of a suggested method for removal of SO2, a pollutant that irritates airways causing coughi...

Solved • Mar 20, 2020

Gibbs Free Energy

Q. For each of the following reactions, calculate ΔH°rxn, ΔS°rxn, and ΔG°rxn at 25 °C. Express your answer using two significant figures.NH4Cl(s)→HCl(...

Solved • Mar 20, 2020

Gibbs Free Energy

Q. For each of the following reactions, calculate ΔH°rxn, ΔS°rxn, and ΔG°rxn at 25 °C. Express your answer using two significant figures.N2O4(g)→2NO2(...

Solved • Mar 20, 2020

Gibbs Free Energy

Q. What is the standard Gibbs free energy for the transformation of diamond to graphite at 298 K? Cdiamond → Cgraphite Express your answer to three si...

Solved • Mar 20, 2020

Gibbs Free Energy

Q. Consider the following reaction occurring at 298 K: BaCO3(s) ⇌ BaO(s) + CO2(g)A) Show that the reaction is not spontaneous under standard condition...

Solved • Mar 20, 2020

Gibbs Free Energy

Q. Calculate ΔG°rxn at 298 K for the following reaction: I2(g)+Cl2(g)⇌2ICl(g), Kp=81.9Express the free energy of the reaction in kilojoules to three s...

Solved • Mar 20, 2020

Gibbs Free Energy

Q. For the reaction 2CH4(g)→C2H6(g)+2H2(g) calculate ΔG∘rxn at 25 °C.Express your answer using one decimal place.Standard Thermodynamic Quantities for...

Solved • Mar 20, 2020

Gibbs Free Energy

Q. Consider the oxidation of NO to NO2 :NO(g) + 1/2O2(g) → NO2(g) Reactant or product  ΔH°f(kJ/mol)  S°(J/mol•K)  NO 91.3 210.8 O2 0 205.2 NO2 33.2 24...

Solved • Mar 18, 2020

Gibbs Free Energy

Q. Which of the following conditions is always true at equilibrium.So there are two boxes where I have to sort the choices in. Box number 1 is called ...

Solved • Mar 17, 2020

Gibbs Free Energy

Q. The Kb for methylamine, CH3NH2, at 25 C is 4.4 x 10-4A. Write the chemical equation for the equilibrium that corresponds to Kb.B. By using the valu...

Solved • Mar 13, 2020

Gibbs Free Energy

Q. Consider the following Gibbs energies at 25 °C.Substance Ag (aq) Cl–(aq) AgCl(s) Br–(aq) AgBr(s)(a) Calculate ?G°rxn for the dissolution of AgCl(s)...

Solved • Mar 13, 2020

Gibbs Free Energy

Q. Estimate the value of the equilibrium constant at 620 K for each of the following reactions. ΔG°f for BrCl(g) is ≅ 1.0 kJ/mol.(1) 2 NO2(g) ⇌ N2O4(g...

Solved • Mar 13, 2020

Gibbs Free Energy

Q. Determine ∆G° for the following reaction:CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)Substance                          ∆Gf° (kJ/mol)CH4(g)                  ...

Solved • Feb 18, 2020

Gibbs Free Energy

Q. What is the free energy change, ∆G°, for the equilibrium between hydrogen iodide, hydrogen, and iodine at 726K? Kc = 0.020 2HI(g) ⇌ H2(g) + I2(g)A)...

Solved • Feb 18, 2020

Gibbs Free Energy

Q. Use the given data at 298 K to calculate ∆G° for the reaction2Cl2(g)       +       SO2(g)       →       SOCl2(g)       +        Cl2O(g)Substance:  ...

Solved • Feb 18, 2020

Gibbs Free Energy

Q. For the following reaction, Kp = 2.25 x 104 at 298 K and ΔHrxn = -128 kJ/mol.CO (g) + 2 H2 (g) ⇌ CH3OH (l)Which of the following is the correct val...

Solved • Feb 10, 2020

Gibbs Free Energy

Q. When a system is at equilibrium,________.A) the process is not spontaneous in either directionB) the reverse process is spontaneous but the forward...

Solved • Jan 28, 2020

Gibbs Free Energy

Q. Calculate AG° (in kJ/mol) for the following reaction at 1 atm and 25°CC2H6 (g) + O2 (g) → CO2 (g) H2O (l)ΔHf° C2H6 (g) = -84.7 kJ/mol; S° C2H6 (g) ...

Solved • Jan 28, 2020

Gibbs Free Energy

Q. Calculate ΔG° (in kJ/mol) for the following reaction at 1 atm and 25°C:C2H6 (g) + O2 (g) → CO2 (g) + H2O (l)ΔGf °C2H6 (g) = 32.89 kJ/molΔGf° CO2 (g...

Solved • Jan 28, 2020

Gibbs Free Energy

Q. TRUE/FALSE. Write 'T' if the statement is true and 'F' if the statement is false.The more negative ΔG ° is for a given reaction, the larger the val...

Solved • Jan 28, 2020

Gibbs Free Energy

Q. At 25 °C, 1.0 M methylpropene (1) was added to a reaction vessel. Upon addition of a suitable catalyst, an equilibrium mixture of three isomeric co...

Solved • Jan 6, 2020

Gibbs Free Energy

Q. The decomposition of isopropanol to form acetone and hydrogen gas (reaction shown below) has an equilibrium constant of 0.44 at 452 K. Assume ΔH° a...

Solved • Jan 6, 2020

Gibbs Free Energy

Q. The decomposition of isopropanol to form acetone and hydrogen gas (reaction shown below) has an equilibrium constant of 0.44 at 452 K. Assume ΔH° a...

Solved • Jan 6, 2020

Gibbs Free Energy

Q. If K is much less than 1 for a given reaction then, a. ΔH is a large positive numberb. ΔG is 0c. ΔG is a large positive numberd. ΔG is a large nega...

Solved • Dec 19, 2019

Gibbs Free Energy

Q. The standard free energy change for a chemical reaction is +13.3 kJ/mol. What is the equilibrium constant for the reaction at 125 °C? (R = 8.314 J/...

Solved • Dec 19, 2019

Gibbs Free Energy

Q. For the evaporation of water during perspiration on a hot, dry day,a. ΔH is positive and TΔS < ΔH.b. ΔH is negative and TΔS < ΔH.c. ΔH is pos...

Solved • Dec 19, 2019

Gibbs Free Energy

Q. The value of G° for a reaction conducted at 25 °C is 2.8 kJ/mol The equilibrium constant for a reaction is __________ at this temperature?

Solved • Dec 19, 2019

Gibbs Free Energy

Q. For the combustion of one mole of liquid ethanol, ΔH° = -726 kJ. Which answer is closest to ΔG° for this reaction at 2500 °C, given that S° (J/mol ...

Solved • Dec 19, 2019

Gibbs Free Energy

Q. Given the values of ΔGf° given below in kJ/mol calculate the value of ΔG° in kJ for the reaction,NH3(g) + HBr(g) => NH4Br(s)ΔGf° (NH3(g)) = -17Δ...

Solved • Dec 18, 2019

Gibbs Free Energy

Q. Use the table below to answer the questions that follow.The value of G° at 25 °C for the decomposition of calcium chloride into its constituent ele...

Solved • Dec 18, 2019

Gibbs Free Energy

Q. Use the table below to answer the questions that follow.The value of ΔG° at 25 °C for the formation of POCl3 from its constituent elements,P2(g) + ...

Solved • Dec 18, 2019

Gibbs Free Energy

Q. The standard free energy for a reaction is ΔG° = – 33.0 kJ. At 25°C the equilibrium constant for this reaction , Kp = ________. Enter your answer i...

Solved • Dec 18, 2019

Gibbs Free Energy

Q. Given the values of ΔGf° given below in kJ/mol, calculate the value of ΔG° in kJ for the reaction at 298 K.:3 NO2(g) + H2O(l) => 2 HNO3(l) + NO(...

Solved • Dec 18, 2019

Gibbs Free Energy

Q. For the combustion of one mole of liquid ethanol, ΔH° = -726 kJ. Which answer is closest to ΔG° for this reaction at 2500 °C, given that S° (J/mol ...

Solved • Dec 18, 2019

Gibbs Free Energy

Q. For the reaction, Fe2O3 (s) + 3 H2(g) <=> 2 Fe(s) + 3 H2O(g), ΔG° = 63 kJ at 25 °C and ΔH° = 100 kJ. Which of the following is completely tru...

Solved • Dec 18, 2019

Gibbs Free Energy

Q. Use the table below to answer the questions that follow.The value of G° at 25 °C for the decomposition of calcium chloride into its constituent ele...

Solved • Dec 18, 2019

Gibbs Free Energy

Q. At 298 K, ΔG°f is -620 kJ/mol for SiCl4(g) and -592 kJ/mol for MgCl2(s). Calculate ΔG° (kJ) for the reaction below at 298 K if the pressure of SiCl...

Solved • Dec 18, 2019

Gibbs Free Energy

Q. Given that the ΔGf° (kJ/mol) at 298 K for difluoroacetylene (C2F2) and hexafluorobenzene (C6F6) are 185.3 and 81.3, respectively, what is K at 298 ...

Solved • Dec 17, 2019

Gibbs Free Energy

Q. Given the values of ΔGf° given below in kJ/mol, calculate the value of ΔG° in kJ for the reaction:3 NO(g) => N2O(g) + NO2(g)ΔGf° (NO) = 84ΔGf° (...

Solved • Dec 17, 2019

Gibbs Free Energy

Q. For the reaction, Fe2O3(s) + 3 H2(g) <=> 2 Fe(s) + 3 H2O(g), ΔG° = 53 kJ at 25 °C and ΔH° = 100 kJ. Which of the following is completely true...

Solved • Dec 17, 2019

Gibbs Free Energy

Q. Use the table below to answer the questions that follow.The value of ΔG° at 25 °C for the formation of calcium chloride from its constituent elemen...

Solved • Dec 17, 2019

Gibbs Free Energy

Q. Consider the following system at equilibrium at 25°C: PCl3(g) + Cl2(g) <=> PCl5(g) for which ∆G° = -92.50 kJ. What will happen to the ratio o...

Solved • Dec 16, 2019

Gibbs Free Energy

Q. Given that the ∆G°f (kJ/mol) at 298 K for difluoroacetylene (C2F2) and hexafluorobenzene (C6F6)  are 185.3 and 81.3, respectively, what is K at 298...

Solved • Dec 16, 2019

Gibbs Free Energy

Q. Given the values of ΔGf° given below in kJ/mol, calculate the value of ΔG° in kJ for the reaction:3 NO(g) → N2O(g) + NO2(g)ΔGf° (NO) = 83ΔGf° (NO2)...

Solved • Dec 16, 2019

Gibbs Free Energy

Q. Use the table below to answer the questions that follow.The value of ΔG° at 25 °C for the oxidation of solid elemental sulfur to gaseous sulfur dio...

Solved • Dec 16, 2019