@X@user.full_name@X@ @GMU: What would the pH be after addition of 5.08 mL of 0.1000 M NaOH to 25.00 mL of 0.1000 HA (a weak acid, Ka = 2.52e-5)?

@X@user.full_name@X@ @GMU: How much energy in kJ is released to form one mole of 123Sb from protons, electrons, and neutrons if the nucleus has a mass of 122.904216 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: When 2.931 g of urea was dissolved in 100.6 g of benzene, the freezing point was 276.2 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.

@X@user.full_name@X@ @GMU: Which reactant in the reaction below is an acid (this one first in the answer) and which reactant is a base?HCl + ClO-4 → HClO4 + Cl-

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 (C4H10(g)) = 310.1000J/mol*K and the heat of formation of C4H10(g)) is -126.1400 kJ/mol.C4H10(g) → 4C(gr) + 5H2(g)

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 (C3H8(g)) = 270.2000J/mol*K and the heat of formation of C3H8(g)) is -103.8500 kJ/mol.C3H8(g) → 3C(gr) + 4H2(g)

@X@user.full_name@X@ @GMU: Which product in the reaction below is an acid (this one first in the answer) and which product is a base?BrO- + HCO-3 → HBrO + CO3-

@X@user.full_name@X@ @GMU: By how much would the rate of reaction (see below) change if the concentration of Cl2 increased by a factor of 2.481. The rate law of this reaction is Rate = k1/2.CHCl3(g) + Cl2(g) → CCl4(g) + HCl(g)

@X@user.full_name@X@ @GMU: What is the equilibrium concentration of H3O+ in 0.1724 M H2S? See reaction belowH2S + H2O → HS- + H3O+ Ka = 9.100×10-8

@X@user.full_name@X@ @GMU: The osmotic pressure of an unknown solution is 0.568 atm at 12.84 °C. Which of the solutions below is the most likely one? Assume any salt is completely ionic!