Equation to be used:
ΔG = ΔH – TΔS
( ΔG = Gibbs free energy change, ΔH =Enthalpy change, T = Temperature, ΔS = entropy change)
Part B:
ΔH°rxn = -1684 kJ
ΔS°rxn = -543.7 J/K = -0.5437 kJ/K [1000J = 1kJ]
T = 3652 K
Putting the values in the equation, we get:
ΔG = ( -1684 kJ ) – (3652 K)( -0.5437 kJ/K)
Or, ΔG = 301.59 kJ
Part C
At equilibrium, ΔG° = 0.
So, at equilibrium ΔH°= Teq ΔS°
Putting the values :
-1684 kJ = Teq (-0.5437 kJ/K)
Or, Teq = 3097 K
(Here, the value of ΔH and ΔS used have been same throughout since it is mentioned that they do not change with temperature.
What is the Gibbs free energy for this reaction at 3652 K ? Assume that AH...
PART A: What is the Gibbs free energy for this reaction at 3652 K ? Assume that ?H and ?S do not change with temperature. PART B: At what temperature Teq do the forward and reverse corrosion reactions occur in equilibrium? The chemical reaction that causes iron to corrode in air is given by in which at 298 K rxn AS-543.7 J/K
The chemical reaction that causes iron to corrode in air is given by 4Fe(s)+3O2(g)→2Fe2O3(s) 4 F e ( s ) + 3 O 2 ( g ) → 2 F e 2 O 3 ( s ) and ΔrH∘ Δ r H ∘ = −1684 kJ mol−1 = − 1684 k J m o l − 1 ΔrS∘ Δ r S ∘ = −543.7 J K−1 mol−1 = − 543.7 J K − 1 m o l − 1 part...
The chemical reaction that causes aluminum to corrode in air is given by 4A1 + 30, +2A1, in which at 298 K AH. = – 3352 kJ AS = -625.1 J/K Part A What is the standard Gibbs free energy for this reaction? Assume the commonly used standard reference temperature of 298 K. Express your answer as an integer and include the appropriate units. Part B What is the Gibbs free energy for this reaction at 5975 K ? Assume...
The chemical reaction that causes chromium to corrode in air is given by 4Cr+3O2→2Cr2O3 in which at 298 K ΔH∘rxn = −2256 kJ ΔS∘rxn = −549.1 J/K Part A What is the standard Gibbs free energy for this reaction? Assume the commonly used standard reference temperature of 298 K. Express your answer as an integer and include the appropriate units. Part B What is the Gibbs free energy for this reaction at 4717 K ? Assume that ΔH and ΔS...
Item 29 Calculate the change in Gibbs free energy for each of the sets of AH ASP, and T given in the following problems. Part A AH = + 131 kJ : AS. = - 262 J/K;T = 308 K % AED Om ? AG. Submit Request Answer Part B AHX = - 131 kJ: ASX = +262 J/K:T = 308 K O AL ROO? AG = Submit Request Answer Part
Review Consta The chemical reaction that causes aluminum to corrode in air is given by 4Al +30, +2A1,03 in which AH - - 3352 kJ/mol ASM = 625.1 J/(mol-K) What is the standard Gibbs free energy for this reaction? Express your answer as an integer and include the appropriate units. View Available Hints) AG. = -6727540 ) Submit Previous Answers X Incorrect; Try Again: 2 attempts remaining Enter your answer using units of enthalpy Part B What is the Gibbs...
What is the standard Gibbs energy for the transformation of diamond to graphite at 298 K? Cdiamond+Cgraphite Express your answer to three significant figures and include the appropriate units. ► View Available Hint(s)
Item 29 Part Calculate the change in Gibbs free energy for each of the sets of AH A Sex, and T given in the following problems. AHX = - 131 kJ: ASP.x = -262 J/K;T = 308 K Express your answer using two significant figures. 10 AED + + O2 ? AG - Submit Request Answer Part D AH = - 131 kJ; ASX = -262 J/K;T = 557 K Express your answer using two significant figures. V AC O...
What is the standard Gibbs free energy for the transformation of diamond to graphite at 298 K? Cdiamond+Cgraphite Express your answer to three significant figures and include the appropriate units. ► View Available Hint(s) kJ AGran = - 1.90 mol
Item 29 29 of 32 Review | Constants Periodic Table Calculate the change in Gibbs free energy for each of the sets of AH AS and T given in the following problems. Submit Request Answer Predict whether or not the reaction in part will be spontaneous at the temperature indicated. (Assume that all reactants and products are in their standard States.) spontaneous nonspontaneous Submit Part H Predict whether or not the reaction in part and products are in their standard...