Blog

@X@user.full_name@X@ @GMU: What is the pH of 3.22e-3 M HClO3 ?

@X@user.full_name@X@ @GMU: When 10.70 g of aspirin was dissolved in 107.9 g of benzene, the freezing point was 275.8 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: Calculate the [H3O+] of 108.32 mL of a buffer initially consisting of 0.1881 M CH3(CH2)2CH2NH2 and 0.0979 M CH3(CH2)2CH2NH3Cl after addition of 0.0028 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: 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!

@X@user.full_name@X@ @GMU: How much energy in kJ is released to form one mole of 180Ta from protons, electrons, and neutrons if the nucleus has a mass of 179.947462 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 cell voltage for the following cell?2Cu+(aq) + Pb(s) → 2Cu(s) + Pb2+(aq) ΔGo = -125.430 kJ

@X@user.full_name@X@ @GMU: The reaction below occurs in an electrochemical cell. Which substance would be the best solid electrode in the given half-cell?Cu2+(aq) + Sn(s) → Cu(s) + Sn2+(aq)

@X@user.full_name@X@ @GMU: Determine the molality of a 8.985 wt % aqueous solution of LiI.

@X@user.full_name@X@ @GMU: What is the value of Ksp in water, if 8.20e-7 M of A2B3 dissolves according to the reaction below?A2B3(s)→2A(aq) + 3B(aq) where A and B are ions

@X@user.full_name@X@ @GMU: Which of the answers below is the correct representation according to the shorthand method of the following galvanic cell?Cu2+(aq) + Ni(s) → Cu(s) + Ni2+(aq)