@X@user.full_name@X@ @GMU: Which pair of substances are bases in the reaction below?HI + HS- → H2S + I-

@X@user.full_name@X@ @GMU: RbF has a face-centered cubic unit cell in which the F- anions occupy corners and face centers, while the cations fit into the hole between adjacent anions. What is its density if the ionic radii of Rb+, F- ions are 154.2 pm and 136.0 pm, respectively?

@X@user.full_name@X@ @GMU: What is the standard free energy change for the ionization of NH+4 acid, if its Ka is 5.60e-10.

@X@user.full_name@X@ @GMU: Calculate the of 105.66 mL of a buffer initially consisting of 0.1353 M N2H4 and 0.1741 M N2H5Cl after addition of 0.0022 mol of HCl. Assume that no volume change occurs after addition of the acid. The Kb of N2H4 is 8.90e-7

@X@user.full_name@X@ @GMU: What is the balanced reaction at the cathode for the following galvanic cell?Cu(s)| Cu2+(aq) || Sn2+(aq) | Sn(s)

@X@user.full_name@X@ @GMU: The reaction below occurs in the electrochemical cell. Which answer is correct?3Ni2+(aq) + 2Cr(s) → 3Ni(s) + 2Cr3+(aq)

John Schreifels  @GMU: To what temperature would the reaction below need to be heated to have a rate constant of 6.11e-4 s-1 if the rate constant was 1.800e-4 s-1 at 477.00°C and the activation energy was 270.00 kJ/mol?Cyclopropane → Propene

@X@user.full_name@X@ @GMU: What is the value of Ksp in water, if 6.18e-5 M of A3B3 dissolves according to the reaction below?A3B3(s)→3A(aq) + 3B(aq) where A and B are ions

@X@user.full_name@X@ @GMU: What is the fraction of A remaining after 94.689 seconds if the first order rate constant is 5.751e-3 s-1?

@X@user.full_name@X@  @GMU: When 9.889 g of aspirin was dissolved in 107.4 g of benzene, the freezing point was 276.0 K. What is the formula mass of this compound? The freezing point depression constant for benzene is 5.12 (°C*kg)/mol. The melting point and boiling points are 5.50°C and 80.10°C, respectively.