Question

In: Chemistry

What is the standard free energy change for the reaction below? Is the reaction expected to...

What is the standard free energy change for the reaction below? Is the reaction expected to be spontaneous under standard conditions?

FeS(s) + O2(g) → Fe(s) + SO2(g)

Expert Solution

Answer :

The standard free energy change for the reaction can be determined by considering the standard free energy changes of formation (∆G°_f) for each of the products and the reactants.

The standard free energy change of a reaction is :

The given reaction is :

The standard free energy changes of formation for each reactants and products are :

Compound	FeS(s)	O₂(g)	Fe(s)	SO₂(g)
∆G°_f (kJ/mol)	-100.4	0.0	0.0	-300.2

Thus, the standard free energy change for the given reaction is =

Or, Thus, the free energy change for the above reaction is -199.8 kJ/mol

Now, we know for a spontaneous reaction, the free energy change of a reaction is negative .

And, for a non-spontaneous reaction, the free energy change of a reaction is positive.

As, for the above reaction the standard free energy change of the reaction is negative, thus it is spontaneous under standard conditions.

queen_honey_blossom answered 2 years ago

Summarize why the difference between free energy change and standard free energy change depends on the...

Summarize why the difference between free energy change and standard free energy change depends on the concentrations of the reactants and products in biochemistry.

A reaction A + B <==> C has a standard free-energy change of -3.27 kJ/mol at...

A reaction A + B <==> C has a standard free-energy change of -3.27 kJ/mol at 25oC What are the concentrations of A, B, and C at equilibrium if at the beginning of the reaction their concentrations are 0.30M, 0.40M and 0M respectively?

Calculate the standard change in Gibbs free energy, ΔGrxn∘, for the given reaction at 25.0 ∘C....

Calculate the standard change in Gibbs free energy, ΔGrxn∘, for the given reaction at 25.0 ∘C. Consult the table of thermodynamic properties for standard Gibbs free energy of formation values. KBr(s)↽−−⇀K+(aq)+Br−(aq) ΔGrxn°= ? kJ/mol Determine the concentration of K+(aq) if the change in Gibbs free energy, nΔGrxn, for the reaction is −8.95 kJ/mol. [K+] = ? M

Calculate the free-energy change of the following reaction at 352°C and standard pressure. Values in the...

Calculate the free-energy change of the following reaction at 352°C and standard pressure. Values in the table are at standard pressure and 25°C. C2H4 + 3O2 --> 2CO2 +2H2O ΔHºf,(kJ/mol) Sºf, J/mol•K ΔGºf, kJ/mol C2H4(g) 52.3 219.5 68.1 O2(g) 0 205.0 0 CO2(g) -393.5 213.6 -394.4 H2O(g) -241.8 188.7 -228.6

A reaction: A (aq) + B (aq) <-----> C (aq) has a standard free energy change...

A reaction: A (aq) + B (aq) <-----> C (aq) has a standard free energy change of -3.05 kJ/mol at 25 C. What are the concentrations of A, B, and C at equilibrium if, at the beginning of the reaction, their concentrations are 0.30 M, 0.40 M, and 0 M, respectively? A = ? M B= ? M C= ? M How would your answer above change if the reaction had a standard free energy change of +3.05 kJ/mol? A.)...

A reaction A (aq) + B (aq) <--> C (aq) has a standard free-energy change of...

A reaction A (aq) + B (aq) <--> C (aq) has a standard free-energy change of –3.85 kJ/mol at 25 °C. What are the concentrations of A, B, and C at equilibrium if, at the beginning of the reaction, their concentrations are 0.30 M, 0.40 M, and 0 M, respectively? [A]= M [B]= M [C]= M

What is the standard free energy of the reaction, in kJ, at 298K for: 1 A...

What is the standard free energy of the reaction, in kJ, at 298K for: 1 A (aq) + 1 B (aq) <--> 2 C (aq) + 2 D (aq) if ΔH° (A)= -3.4134 kJ/mol , ΔH° (B) = 93.8823 kJ/mol, ΔH° (C) = -26.8495 kJ/mol, and ΔH° (D) = -39.4984 kJ/mol ΔS° (A)= 33.3845 J/(mol K) , ΔS° (B) = 92.5722 J/(mol K) , ΔS° (C) = -59.1781 J/(mol K) , and ΔS° (D) = -12.7602 J/(mol K)

The standard free energy change of phosphate hydrolysis is shown below for several molecules in the...

The standard free energy change of phosphate hydrolysis is shown below for several molecules in the glycolytic pathway. Molecule ?G? (kJ/mol) Phosphoenolpyruvate ?61.9 1,3-Bisphosphoglycerate ?49.4 ATP ? ADP + Pi ?30.5 Fructose-6-phosphate ?15.9 Glucose-6-phosphate ?13.8 Which statement explains why glucose phosphorylation could not occur without ATP investment? A. Without ATP investment in stage I of glycolysis, the concentration of ATP would become too high and would inhibit phosphofructokinase, leading to inhibition of the entire glycolytic pathway. B. Without ATP investment,...

Consider the reaction NH4Cl(aq)NH3(g) + HCl(aq) The standard free energy change for this reaction is 62.8...

Consider the reaction NH4Cl(aq)NH3(g) + HCl(aq) The standard free energy change for this reaction is 62.8 kJ. The free energy change when 1.72 moles of NH4Cl(aq) react at standard condition is____ kJ. What is the maximum amount of useful work that the reaction of 1.72 moles of NH4Cl(aq) is capable of producing in the surroundings under standard conditions?_______ If no work can be done, enter none. kJ

A reaction has a very negative change in free energy. Will the reaction proceed as written?...

A reaction has a very negative change in free energy. Will the reaction proceed as written? Why/why not? If so what would stop the reaction from proceeding / if not what would cause it to proceed?