@X@user.full_name@X@ @GMU: What is the standard free energy change for the following cell?2Cu+(aq) + Sn(s) → 2Cu(s) + Sn2+(aq) Ecoell = 0.660V

@X@user.full_name@X@ @GMU: What is the pOH of a 0.1768 M H2CO3 ? See reaction belowH2CO3 + H2O → HCO-3 + H3O+ Ka = 4.300×10-7

@X@user.full_name@X@ @GMU: What is the conjugate base and base dissociation constant of NH+4 if its acid dissociation constant is 5.600×10-10 ?

John Schreifels @GMU: What is the total entropy change at 25oC for the reaction below, if the standard entropies of reactants and products are So(C(gr)) = 5.74 J/mol*K, So (H2(g)) = 130.68 J/mol*K, and So (C7H16(g)) = 426.3000J/mol*K and the heat of formation of C7H16(g)) is -187.9000 kJ/mol.C7H16(g) → 7C(gr) + 8H2(g)

@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 (C5H10(g)) = 347.7700J/mol*K and the heat of formation of C5H10(g)) is -20.9300 kJ/mol?C5H10(g) → 5C(gr) + 5H2(g)

@X@user.full_name@X@ @GMU: What is Kp for the reaction below, if Kc = 7.96e-6 at 110.0°C?2A(s) + 3B(g) → 4C(g)

@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?2Cu+(aq) + Sn(s) → 2Cu(s) + Sn2+(aq)

@X@user.full_name@X@ @GMU: Hydrogen iodide decomposes at 410°C according to second order kinetics (see reaction below). The half-life for this reaction was measured to be 1.64e4 s when the initial concentration of HI was 1.98e-3 M. What is the rate constant for this reaction?HI(g) → H2(g) + I2(g)

@X@user.full_name@X@ @GMU: What is the fraction of A remaining after 92.289 seconds if the first order rate constant is 8.484e-3 s-1?

@X@user.full_name@X@ @GMU: What is the concentration of OH- in 0.1628 M CH3COOH ? See reaction belowCH3COOH + H2O → CH3COO- + H3O+ Ka = 1.760×10-5