@X@user.full_name@X@ @GMU: What is the pH of 1.58e-4 M H2SO4 ?

@X@user.full_name@X@ @GMU: What is the standard free energy change for the following cell?2Cu+(aq) + Pb(s) → 2Cu(s) + Pb2+(aq) Ecoell = 0.650V

John Schreifels @GMU: What is the change in mass of 65Cu when it is formed from protons, electrons and neutrons if the atom has a mass of 64.9277929 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 Kp for the reaction below, if Kc = 2.38e-5 at 146.4°C?3A(s) + 3B(g) → 2C(g)

@X@user.full_name@X@ @GMU: What is the coefficient, b, in the reaction below, if Kc = 1.65e-5 and Kp = 3.39e-7 at 320.84°C?3A(s) + bB(g) → 3C(g)

@X@user.full_name@X@ @GMU: What is the standard free energy change for the ionization of HCO-3 acid, if its Ka is 4.80e-11.

@X@user.full_name@X@ @GMU: NO2 at 354°C decomposes to form NO and O2 according to second order kinetics (see reaction below). The half-life for this reaction was measured to be 1.91e2 s when the initial concentration of NO2 was 2.91e-3 M. What is the rate constant for this reaction?2NO2(g) → 2NO(g) + O2(g)

@X@user.full_name@X@ @GMU: Determine the concentration of A after 50.385 minutes if the initial concentration of A was 0.3632 M and the first order rate constant is 1.501e-4 s-1.

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 HCOOH increased by a factor of 2.394. The rate law of this reaction is Rate = k.HCOOH(aq) + Br2(aq) → 2Br-(aq) + CO2(g)