@X@user.full_name@X@ @GMU: How much time in days would it take for a 1.5967 g sample of 18F to decay to a mass of 1.0178 g if it has a half-life of 6.588e3 s.

@X@user.full_name@X@ @GMU: What is the standard free energy change for the following cell?3Cu2+(aq) + 2Cr(s) → 3Cu(s) + 2Cr3+(aq) Ecoell = 1.080V

@X@user.full_name@X@ @GMU: What is the solubility in g/L of C2H6 at a partial pressure of 292.3 torr, if the solubility at a partial pressure of 368.8 torr is 0.02626 g/L?

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 (C9H16(g)) = 484.8200 J/mol*K and the heat of formation of C9H16(g)) is 61.8300 kJ/mol.9C(gr) + 8H2(g) → C9H16(g)

@X@user.full_name@X@ @GMU: What is the cell voltage for the following cell?2Fe3+(aq) + 3Cd(s) → 2Fe(s) + 3Cd2+(aq) ΔGo = -208.408 kJ

@X@user.full_name@X@ @GMU: NO2 at 378°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 2.56e1 s when the initial concentration of NO2 was 9.54e-3 M. What is the rate constant for this reaction?2NO2(g) → 2NO(g) + O2(g)

@X@user.full_name@X@ @GMU: Which product in the reaction below is a base (this one first in the answer) and which product is an acid?ClO-4 + HClO → HClO4 + ClO-

@X@user.full_name@X@ @GMU: How much energy in kJ is released to form one mole of 204Pb from protons, electrons, and neutrons if the nucleus has a mass of 203.973020 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 cell voltage for the following cell?Fe3+(aq) + Al(s) → Fe(s) + Al3+(aq) ΔGo = -468.917 kJ

@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 2.304. The rate law of this reaction is Rate = k[NO2]2.NO2(g) + CO(g) → CO2(g) + NO(g)