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@X@user.full_name@X@ @GMU: Calculate the [H3O+] of 118.28 mL of a buffer initially consisting of 0.1476 M NH2OH and 0.1728 M NH3OHBr after addition of 0.0033 mol of HCl. Assume that no volume change occurs after addition of the acid. The Kb of NH2OH is 9.10e-9

John Schreifels @GMU: Which reaction below would result in a net increase in entropy?

@X@user.full_name@X@ @GMU: What is the temperature at which the reaction below becomes spontaneous, if the standard entropies of reactants and products at 25oC are So (C(gr)) = 5.74 J/mol*K, So(H2(g)) = 130.68 J/mol*K, and So (C4H6(g)) = 283.4000J/mol*K and the heat of formation of C4H6(g)) is 148.0700 kJ/mol?4C(gr) + 3H2(g) → C4H6(g)

@X@user.full_name@X@ @GMU: Initially there were equilibrium concentrations of 0.3600 M A, 0.2914 M B, and 0.1923 M C. Which change will cause the equilibrium to shift from left to right if the reaction is exothermic? Use the reaction below.5A(aq) → 2B(aq) +3C(aq) K = 1.312

@X@user.full_name@X@ @GMU: What is the standard free energy change for the ionization of H2O2 acid, if its Ka is 2.40e-12.

@X@user.full_name@X@ @GMU: What is the standard free energy change for the following cell?2Cu+(aq) + Ni(s) → 2Cu(s) + Ni2+(aq) Ecoell = 0.780V

@X@user.full_name@X@ @GMU: What is the free energy change for the reaction below, if the reaction quotient, Q, at 25.0oC is equal to 5.81e-5?3C2H2(g) → C6H6(g) ΔGo = -498.180 kJ.

@X@user.full_name@X@ @GMU: The reaction below occurs in an electrochemical cell. Which substance would be the best solid electrode in the given half-cell?3Cu+(aq) + Al(s) → 3Cu(s) + Al3+(aq)

@X@user.full_name@X@ @GMU: What is the vapor pressure of acetic acid, CH3COOH, at 357.3 K if its heat of vaporization and normal boiling point are 23.64 kJ/mol and 391.0 K, respectively?

@X@user.full_name@X@ @GMU: What is the equilibrium concentration of H3O+ in 0.1216 M HF? See reaction belowHF + H2O → F- + H3O+ Ka = 6.600×10-4