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@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.

¶ D, line 49. Employees are required to speak English at all times.This requirement violates which federal law?

@X@user.full_name@X@ @GMU: NaBr has a face-centered cubic unit cell in which the Br- anions occupy corners and face centers, while the cations fit into the hole between adjacent anions. What is the radius of Na+ if the ionic radius of Br- is 195.0 pm and the density of NaBr is 3.200 g/cm3?

@X@user.full_name@X@ @GMU: How much energy in kJ is released to form one mole of 191Ir from protons, electrons, and neutrons if the nucleus has a mass of 190.960584 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 fraction of A remaining after 63.846 minutes if the first order rate constant is 2.813e-4 s-1?

@X@user.full_name@X@ @GMU: Initially there were equilibrium concentrations of 0.3096 M A, 0.2507 M B, and 0.1624 M C. Which change will cause the equilibrium to shift from left to right if the reaction is exothermic? Use the reaction below.3A(aq) → 3B(aq) +4C(aq) K = 0.748

@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 2.33e2 s when the initial concentration of NO2 was 1.05e-3 M. What is the rate constant for this reaction?2NO2(g) → 2NO(g) + O2(g)