@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)

@X@user.full_name@X@ @GMU: What is the standard free energy change for the ionization of hydrazine, if its Kb is 8.90e-7.

@X@user.full_name@X@ @GMU: What is the balanced reaction at the anode for the following galvanic cell?Ni(s) | Ni2+(aq) || Pb2+(aq) | Pb(s)

@X@user.full_name@X@ @GMU: How much time in days would it take for a 1.4460 g sample of 233Pa to decay to a mass of 0.6302 g if it has a half-life of 5.417e6 s.

@X@user.full_name@X@ @GMU: Determine the molality of a 6.563 wt % aqueous solution of NaF.

@X@user.full_name@X@ @GMU: What is the balanced reaction at the anode for the following galvanic cell?Fe(s) | Fe3+(aq) || Cu+(aq) | Cu(s)

@X@user.full_name@X@ @GMU: The vapor pressure of chloroform, CHCl3, (l) at 317.3 K is 407.1 mm Hg. What is the heat of vaporization if its normal boiling point is 334.8 K?