@X@user.full_name@X@ @GMU: What is the solubility in g/L of CO at a partial pressure of 288.7 torr, if the solubility at a partial pressure of 426.9 torr is 0.01636 g/L?

@X@user.full_name@X@ @GMU: What would the pOH be after addition of 13.81 mL of 0.1000 M NaOH to 25.00 mL of 0.1000 HA (a weak acid, Ka = 3.01e-4)?

@X@user.full_name@X@ @GMU: What is the solubility in mol/L of Kr at a partial pressure of 623.6 torr, if the solubility at a partial pressure of 463.7 torr is 0.001702 mol/L?

@X@user.full_name@X@ @GMU: Uranium -238 decays in a series of steps to Pb-206. When the material is very old, one can treat the kinetics as a decay directly to Pb and the ratio of these two can be treated as a measure of the age of a rock. A rock containing 238U and 206Pb was examined to determine its approximate age. The molar ratio of 206Pb to 238U was 0.2165. Assuming no lead was originally present and that all lead formed remained in the rock, what is the age of the rock (in years)? The half-life of 238U is 4.50e9 yr.

@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.