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- Benzene, C6H6, is an aromatic hydrocarbon that exists as a liquid at 298 K and 1 bar. The solubility of benzene in water, defined as the concentration of the saturated solution, is 2.23×10¬3 M at 298 K and 1 bar, and its standard Gibbs free energy of formation is AfG° (C6H6, ) = 124.3 kJ/mol. a. Calculate the standard Gibbs free energy change for the process of dissolution of benzene in water a. Find the chemical potential of the benzene solute standard state AFG° (C6H6, aq).A monoprotic weak acid, HA, dissociates in water according to the reaction HA(aq) = H*(aq) + A¯(aq) The equilibrium concentrations of the reactants and products are [HA] = 0.290 M, H+| = 3.00 × 10¬4 M, and [A-] = 3.00 x 10-4 M. Calculate the value of pKa for the acid HA. pKaB The (Me2C3C%3DCM 2)Fe(CO)4 below -60 C shows three peaks in the intensity ratio 1:1:2 but at 30 °C only a singie, sharp and intense peak is observed. Explain 'H-NMR spectrum of with reference to its structure.
- With the Boltzmann distribution, the population of electrons that correspond to the en- ergy levels of a metal cannot be obtained. Why?.The following 'H NMR and IR spectra are obtained for an unknown compound with an empirical formula of C3H1403. Using the information given, determine the structure of the unknown compound. Show all details in your answer. a) 100 %T 88 20 35ee 3eee 25ee 2e0e 1see 1e00 cm1 2H зн 3H 2H 2H 2H 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 PPM 2878. 16 1716. 08 1234.60 1157.44 BE'T6 882.49A solution contains 0.25 M Ni(NO3)2 and 0.25 M Cu(NO3)2. A. Can the metal ions be separated by slowly adding Na2CO3 aq solution? Assume that for successful separation 99% of the metal ion must be precipitated before the other metal ion begins to precipitate, and assume no volume change on addition of Na2CO3 solution. Ksp of CuCO3 = 1.4 x10-10 Ksp of NiCO3 = 1.42X 10-7 B. If you need to redissolve the salt that was first precipitated, what pH will you use and why ? Write your answers in template provided. Upload your step by step solution for A.
- The main constituents in vinegar are water and ethanoic acid (CH3COOH). In order to determine the concentration of acid in homemade vinegar, a student titrated 25 cm3 of 001 M NaOH against the vinegar. The equation for the reaction is: CH3COOH(aq) + NaOH(aq) ® CH3COONa(aq) + H2O(l) The following titration results were obtained: Burette readings (cm3) Rough 1 2 Final burette reading 20.10 38.90 31.40 Initial burette reading 0.10 20.00 12.50 Volume of vinegar used 20.00 18.90 18.90 (a) What volume of vinegar should be used in the calculation? (b) What is the mole ratio of NaOH:CH3COOH? (c) Calculate the number of moles of alkali in 25 cm3 of NaOH solution used. (d) How many moles of acid were used in the titration? (e) Calculate the…Calculate either [H3O+] or [OH¯] for each of the solutions at 25 °C. Solution A: [OH¯] = 1.43 × 10¯7 M; [H3O+] = Solution B: [H3O+] = 9.77 × 10-⁹ M; [OH¯] = Solution C: [H3O+] = 6.17 × 10−4 M; [OH¯] = Which of these solutions are basic at 25 °C? Solution A: [OH-] = 1.43 × 10¯7 M Solution B: [H₂O+] = 9.77 × 10-⁹ M Solution C: [H₂O+] = 6.17 × 10−4 M M M M1. The solubility of magnesium hydroxide (Mg(OH)2) is approximately 3.70 x10- M at room temperature. a. Write the aqueous dissolution ionic reaction for magnesium hydroxide. Include state symbols. b. Calculate the solubility product constant (Ksp) for magnesium hydroxide at room temperature. Refer back to the General Formula for “K" presented in the "Equilibrium Lab Manual" c. How many grams of magnesium hydroxide are present in 1.0 L of a saturated solution at room temperature?
- Balance the following (fictional) chemical equations by supplying the correct coefficient. Do not leave any space blank (in other words, write in 1 if you would be leaving it blank): R(OZ)2 - RY2+ Z20 a) ZY+ b) D2 (g) + L2 (g) – DL3 (e)The atomic emission spectrum for a particular element includes blue-violet light with wavelength 440. nm. Calculate the energy in joules of this light given that E = h c/A, and h = 6.63 x 10-34Js, and c = 3.00 x 10°m/s. (h andc are constants, A is wavelength, convert nm into m) h c E =Provide a brief definition and a description of the significance of the following terms in NMR spectroscopy (1) CW-NMR spectroscopy (2) the nuclear Overhauser effect (3) the free induction decay(4) a 90o pulse(5) J coupling(6) distance geometry(7) intermediate exchange(8) SAR by NMR(9) the Larmour frequency(10) residual dipolar couplings