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- I Cottiz' , O, + 6Oz>LocOz+ LottzO+362,5 KJ +602 6COz+ +6tt20+362,5 KJ What are the molars masses you might need ? COz? ? cOz? YouCalcule el potencial estándar de la media reacción: HgS(s) + 2 H* (aq) + 2 e --> Hg() + H2S(g) si para la celda a continuación: Cd [Cd2*(1 M) || HgS(s) H* (1 M)| Hg() | H2S(1 atm)| Pt E°celda= -0.317 V y E° (Cd2+/Cd)= -0.403 V E° (HgS/Hg)= ? Seleccione una: a. 0.400 V b. 0.086 V O c. 0.720 V d. -.086 V e. -0.720 VAssignment 4 Consider the following dissociation reaction of iodine at 1000 K: 2(g) = 21(g) The following data is relevant: V(12) = 214.36 cm- %3D B(12)= 0.0373 cm-1 De(l2) = 1.5422 eV %3D The ground state of the iodine atoms is 2P3/2 which implies fourfold degeneracy. Calculate the equilibrium constant for the reaction. 13
- Solute S has a partition co-efficient of 3.0 between water (Phase 1) and Chloroform (Phase 2). (a) Calculate the concentration of S in chloroform if [S(aq)] is 0.015 M. (b) If the volume of water is 75.0 mL and the volume of chloroform is 15.0 mL, find the quotient (mol S in chloroform)/(mol S in water).the following thermesdyna mic and partial prassuce data, detormine the Gibbs Energy (AG) for the reaction : Give 2 PeO cg) Clz cq> 2 2 Pe OCI (9) at 298 k in kJ /mol substance AG (KJ/ncol ) P (bar) Pe O cg> - 220.4 0.40 ch (q? Information is missing 0.17 PeOckgs 420.4 0.59(3) The partition coefficient Kp for the following is 2.50 Given 500 mL of an aqueous solution containing Compound A, how many grams of A could be removed from the solution by two extractions, each one of 250 mip methylene chloride.
- The Ksp of PbCl2 is 1.7x10-5 at 25oC. What is DGo? Is it possible to prepare a solution that contains Pb2+(aq) and Cl2(aq), at their standard-state concentrations?Solute S has a partition coefficient of 4.0 between water (phase 1)and chloroform (phase 2) in K = AS2/AS1= [S]2/[S]1(a) Calculate the concentration of S in chloroform if [S(aq)] is 0.020 M.(b) If the volume of water is 80.0 mL and the volume of chloroformis 10.0 mL, find the quotient (mol S in chloroform)/(mol S in water).Calculate delt g for Pbl2(s) + Pb2+(aq) +2I-(aq) T= 25C Kp= 8.7x10-9
- The pseudofirst-order rate constant for the decomposition of urea, CO(NH2)(aq) + 2 H2O(I)→ 2 NH4+(aq) + CO32-(aq). is 1.2 x 10-7 s- 1 at 60 °C and 4.6 x 10-7 s-1 at 70 oc. Estimate (a) the activation Gibbs energy and (b) the entropy of activa tion of the reaction.Given below (c): Standard gibb's free energies (∆Gf0 kJ mol-1 ): UO2 = -962.7 UO22+ = -953.5 U4+ = -579.1 Fe2+ = -78.9 Fe(OH)3 ferrihydrite = -692.07 Mn2+ = -288.1 MnO2 pyrolusite = -465.1 HS- = 12.1 H+ = 0 H2O = -237.1 S0 = 0 Given: U(VI) as uraninite; UO2 (where Mn2+ = reductant; MnO2 pyrolusite = product): ∆ Gr0 = -21.3 KJ/mol E0 (emf) = 0.110 V n = 2 F = 96.42 QUESTION: Calculate Eh equation below to calculate at different pH: – Eh = E0 + (RT/nF) * lnK For U(VI) as uraninite; UO2 (where HS- = reductant; S0 = product): UO22+ + Hs- ---- > UO2 + S + H+ [A] pH 3 [B] pH 7Iodine is sparingly soluble in water but much more so in carbon tetrachloride. The equilibrium constant, also called the partition coefficient, for the distribution of I2 between these two phases I2(aq) =12(CCI4) is 83 at 20°C. (a) A student adds 0.028 L of CCI4 to 0.213 L of an aqueous solution containing 0.037 g Iɔ. The mixture is shaken and the two phases are then allowed to separate. Calculate the fraction of I, remaining in the aqueous phase. 4.08.396 X (b) The student now repeats the extraction of I2 with another 0.028 L of CCI4. Calculate the fraction of I2 from the original solution that remains in the aqueous phase. 4.0 .0002608 (c) Compare the result in (b) with a single extraction using 0.056 L of CCI4. Comment on the difference. After a single extraction using 0.056 L of CCI4, the fraction of I2 that remains in the aqueous phase is 49 4.3 This result is larger than the result in (b), which means that a single large extraction is not as efficient as two separate smaller…