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@X@user.full_name@X@ @GMU: How much time in days would it take for a 2.4212 g sample of 18F to decay to a mass of 1.5678 g if it has a half-life of 6.588e3 s.

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 (C6H6(g)) = 269.2000J/mol*K and the heat of formation of C6H6(g)) is 82.9300 kJ/mol.C6H6(g) → 6C(gr) + 3H2(g)

@X@user.full_name@X@ @GMU: Which base listed below would be the best to creat a buffer having a pH of 5.6933?

@X@user.full_name@X@ @GMU: Calculate the pOH of 101.56 mL of a buffer initially consisting of 0.1517 M CH3(CH2)2CH2NH2 and 0.1119 M CH3(CH2)2CH2NH3Br after addition of 0.0021 mol of HCl. Assume that no volume change occurs after addition of the acid. The Kb of CH3(CH2)2CH2NH2 is 4.10e-4

@X@user.full_name@X@ @GMU: What is Kp for the reaction below, if Kc = 3.76e-5 at 170.9°C?4A(s) + 4B(g) → 2C(g)

¶ C, line 37. All applicants must provide proof of U.S. citizenship.This requirement violates which federal law?

@X@user.full_name@X@ @GMU: After 74.372 seconds the concentration of A was reduced from 0.3071 M to 0.2286 M. What is the first order rate constant?

¶ D, lines 52-54. Responsible for maintaining a clean, sanitary, safe, and organized work area. Ensuring all catch pans, floor pans, and waste receptacles are emptied and thrown away in a timely manner. Know, understand, and follow safe operating procedures and Good Manufacturing Practices.These requirements may be not only desirable, but also required under which federal law?

@X@user.full_name@X@ @GMU: What is the balanced reaction at the cathode for the following galvanic cell?Pb(s)| Pb2+(aq) || Cu2+(aq) | Cu(s)

@X@user.full_name@X@ @GMU: How much time in minutes would it take for a 1.7782 g sample of 90Sr to decay to a mass of 1.2996 g if it has a half-life of 9.082e8 s.