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@X@user.full_name@X@ @GMU: The cell potential was -4.59e-2 V at 25oC and a Sn2+(aq) concentration of 0.131 M. What was the hydronium ion concentration? The H2(g) pressure was 1 atm at 25oC.2H+(aq) + Sn(s) → Sn2+(aq) + H2(g) Ecoell = 0.140 V

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 (C6H12(l)) = 204.4000 J/mol*K and the heat of formation of C6H12(l)) is -156.4000 kJ/mol.6C(gr) + 6H2(g) → C6H12(l)

@X@user.full_name@X@ @GMU: By how much would the rate of reaction (see below) change if the concentration of CO increased by a factor of 2.140. The rate law of this reaction is Rate = k[NO2]2.NO2(g) + CO(g) → CO2(g) + NO(g)

John Schreifels @GMU: What is the change in mass of 87Rb when it is formed from protons, electrons and neutrons if the atom has a mass of 86.909187 amu? The masses of the proton, electron and neutron are 1.00728 amu, 0.000549 amu and 1.00867 amu, respectively.

@X@user.full_name@X@ @GMU: What is the pH of a 0.1249 M CH3COOH ? See reaction belowCH3COOH + H2O → CH3COO- + H3O+ Ka = 1.760×10-5

@X@user.full_name@X@ @GMU: What is the pH of 1.34e-4 M HClO4 ?

@X@user.full_name@X@ @GMU: What is Kp for the reaction below, if Kc = 2.24e-3 at 502.3°C?3A(s) + 2B(g) → 4C(g)

@X@user.full_name@X@ @GMU: To what temperature would you have to heat Zn(l) to cause its vapor pressure to become 284.7 mm Hg if its heat of vaporization and boiling point are 131.00 kJ/mol and 1180.2 K, respectively?

@X@user.full_name@X@ @GMU: Which base listed below would be the best to creat a buffer having a pH of 9.6569?

@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 (C6H12(l)) = 204.4000J/mol*K and the heat of formation of C6H12(l)) is -156.4000 kJ/mol?6C(gr) + 6H2(g) → C6H12(l)