@X@user.full_name@X@ @GMU: What must the reaction quotient Q be, if the free energy is -173.628 kJ at 25.0oC?C2H2(g) H2(g) → C2H4(g) ΔGo = -141.144 kJ.

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 (C2H6(g)) = 229.6000 J/mol*K and the heat of formation of C2H6(g)) is -84.6800 kJ/mol.2C(gr) + 3H2(g) → C2H6(g)

@X@user.full_name@X@ @GMU: Which pair of substances are acids in the reaction below?BrO- + HClO4 → ClO-4 + HBrO

@X@user.full_name@X@  @GMU: When 8.092 g of aspirin was dissolved in 107.0 g of benzene, the boiling point was 354.3 K. What is the formula mass of this compound? The boiling point elevation constant for benzene is 2.53 (°C*kg)/mol. The melting point and boiling points are 5.50°C and 80.10°C, respectively.

@X@user.full_name@X@   @GMU: To what temperature would the reaction below need to be heated to have a rate constant of 6.74e-4 M-1s-1 if the rate constant was 2.700e-4 M-1s-1 at 327.00°C and the activation energy was 166.00 kJ/mol?H2(g) + I2(g) → 2HI(g)

@X@user.full_name@X@ @GMU: What is the standard free energy change for the following cell?Fe3+(aq) + Al(s) → Fe(s) + Al3+(aq) Ecoell = 1.620V

@X@user.full_name@X@ @GMU: How much energy in kJ is released to form one mole of 95Mo from protons, electrons, and neutrons if the nucleus has a mass of 94.905841 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: Calculate the pOH of 103.74 mL of a buffer initially consisting of 0.1767 M CH3(CH2)2CH2NH2 and 0.2060 M CH3(CH2)2CH2NH3Br after addition of 0.0025 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: LiBr 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 Br- if the ionic radius of Li+ is 80.07 pm and the density of LiBr is 3.464 g/cm3?

@X@user.full_name@X@ @GMU: Hydrogen iodide decomposes at 410°C according to second order kinetics (see reaction below). The half-life for this reaction was measured to be 4.08e3 s when the initial concentration of HI was 7.96e-3 M. What is the rate constant for this reaction?HI(g) → H2(g) + I2(g)