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Calculate the ionic strength of CaCl2 (aq, 0.001 M) at 298 K.
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- Calculate the value of ΔfG⦵(H2O,l) at 298 K from the standard potential of the cell Pt(s)|H2(g)|HCl(aq)|O2(g)|Pt(s), E⦵cell = +1.23 V.Calculate the ionic strength of a solution that is 0.040 mol kg−1 in K3[Fe(CN)6](aq), 0.030 mol kg−1 in KCl(aq), and 0.050 mol kg−1 in NaBr(aq).Calculate the ionic strength of 0.5M Al2(SO4)3.
- The equilibrium pressure of H2 over a mixture of solid uranium and solid uranium hydride at 500 K is 1.04 Torr. Calculate the standard Gibbs energy of formation of UH3 (s) at 500 K.(a) Calculate the standard potential of the cell Ag(s)|AgNO3(aq)||Cu(NO3)2(aq)|Cu(s) and the standard Gibbs energy and enthalpy of the cell reaction at 25 °C. (b) Estimate the value of ΔrGΘ at 35 °C.Calculate the cell potential at 25°C for the reaction Fe(s)|Fe^3+ (aq,0.0952 M)|| C12(g,7.62 atm) Cl-(aq,0.0577 M)|Pt(s). Eᵒcell= 1.396 V. 3 sig figs in answer.
- The cell potential E for the cell Pt(s) | H2(g, =1.00) | H(aq, =1.00) | NaCl(aq, 0.300 m) | AgCl(s) | Ag(s) at 25°C is +0.260 V. Determine the mean activity coefficient Y+.(a) Calculate the standard potential of the cell Pt(s)|cystine(aq),cysteine(aq)||H+(aq)|O2(g)|Pt(s) and the standard Gibbsenergy and enthalpy of the cell reaction at 25 °c. (b) Estimate the value of ΔrGΘ at 35 °C. Use EΘ = -0.34 V for the cysteine/cystine couple.3) Consider the cell Pt|H2(g)| HCI(aq)|AgCI(s)|Ag, for which the cell reaction is 2 AgCI(s) + H2(g) → 2 Ag(s) + 2 HCl(aq). At 25 °C and a molality of HCl of 0.020 mol kg, Ecell = +0.4658 V. (i) Write the Nernst equation for the cell reaction. (ii) Calculate A,G for the cell reaction. (iii) Assuming that the Debye-Hückel limiting law holds at this concentration, calculate E°(CI", AgCI, Ag).
- The equilibrium pressure of H2 over solid uranium and uranium hydride, UH3, at 500 K is 139 Pa. Calculate the standard Gibbs energy of formation of UH3(s) at 500 K.Calculate the biological standard Gibbs energies of reactions of the following reactions and half-reactions:(a) 2 NADH(aq) + O2(g) + 2 H+(aq) → 2 NAD+(aq) + 2 H2O(I) E⊕=+1.14 V(b) Malate(aq) + NAD+(aq) → oxaloacetate(aq) + NADH(aq) + H+(aq) E⊕=-0.154 V(c) O2(g) + 4H+(aq) + 4 e- → 2 H2O(I) E⊕ = +0.81 VCalculate the standard Gibbs energies at 25 °C of the following reactions from the standard potential data.(a) Ca(s) + 2 H2O(I) → Ca(OH)2(aq) + H2(g)(b) 2 Ca(s) + 4 H2O(I) → 2 Ca(OH)2(aq) + 2H2(g)(c) Fe(s) + 2 H2O(I) → Fe(OH)2(aq) + H2(g)(d) Na2S2O8(aq) + 2 Nal(aq) → 12(s) + 2 Na2SO4(aq)(e) Na2S2O8(aq) + 2 Kl(aq) → l2(s) + Na2SO4(aq) + K2SO4(aq)(f) Pb(s) + Na2CO3(aq) → PbCO3(aq) + 2 Na(s)