Explore BrainMass
Share

Explore BrainMass

    Electrochemistry Problems

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    Last minute cram for finals tonight. I found these as pertains to my weak areas, so, just to see if I am doing ok, if I am wrong, please correct me-I can probably find where I went wrong!

    1. What mass of solid CaO is needed to remove the sulfur dioxide from 1.0 x 106 m3 of air having an SO2 concentration of 1.5 x 10-9 M? Assume that the reaction leading to removal of the sulfur dioxide is CaO(s) + SO2(g) CaCO3(s).

    56 g
    96 g
    37 g
    84 g

    2. Calculate the equilibrium constant for the decomposition of water, 2H2O(l) 2H2(g) + O2(g) at 25oC, given that G (H2O(l)) = -237.2 kJ/mol.

    0.83
    6.3 × 10-84
    2.5 × 10-24
    1.6 × 1083

    3. The equilibrium constant at 427oC for the reaction N2(g) + 3H2(g) 2NH3(g) is
    Kp = 9.4 × 10-5. Calculate the value of Go for the reaction under these conditions.

    -33 kJ/mol
    -54 kJ/mol
    54 kJ/mol
    33 J/mol

    4. Complete and balance the following redox equation that occurs in acidic solution using the set of smallest whole-number coefficients. What is the sum of all the coefficients in the equation?

    PbO2(s) + Cl-→ Pb2+ + Cl2(g) (acidic solution)

    (No choices give on this one) 5

    5. Complete and balance the following redox equation using the set of smallest whole-numbers coefficients. What is the sum of the coefficients?

    HI + HNO3→ I2 + NO (acidic solution)

    5
    7
    14
    17

    6. Complete and balance the following redox equation.

    Br2→ BrO3- + Br- (basic solution)

    The sum of the smallest whole-number coefficients is

    9.
    12.
    18.
    21.

    7. Complete and balance the following redox equation using the set of smallest whole-number coefficients. Now sum the coefficients of all species in the balanced equation. (Remember the coefficients that are equal to one.)

    BrO3-(aq) + Sb3+(aq) → Br-(aq) + Sb5+(aq) (acidic solution)

    4.
    12.
    13.
    17.
    8.If the measured voltage of the cell Zn(s) | Zn2+(aq) || Ag+(aq) | Ag(s) is 1.37 V when the concentration of Zn2+ ion is 0.010 M, what is the Ag+ ion concentration?

    2.5 M
    4.0 × 10-9M
    6.2 × 10-3M
    6.2 × 10-5M

    9.Calculate the cell emf for the following reaction at 25oC:
    Ni(s) + 2Cu2+(0.010 M) → Ni2+(0.0010 M) + 2Cu+(1.0 M)

    0.40 V
    -0.43 V
    0.43 V
    0.37 V

    10. A current of 0.80 A was applied to an electrolytic cell containing molten CdCl2 for 2.5 hours. Calculate the mass of cadmium metal deposited.

    3.2 × 10-7 g
    1.2 × 10-3 g
    4.2 g
    8.4 g

    © BrainMass Inc. brainmass.com April 3, 2020, 7:56 pm ad1c9bdddf
    https://brainmass.com/chemistry/oxidation-reduction-and-electrochemistry/electrochemistry-problems-289609

    Attachments

    Solution Summary

    This solution explains a variety of electrochemistry problems.

    $2.19

    ADVERTISEMENT