Explore BrainMass

Explore BrainMass

    Balancing given redox reaction and calculating percent yield

    Not what you're looking for? Search our solutions OR ask your own Custom question.

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

    #2. Balance the redox equation for the reaction of Cu and HNO3 giving NO2 directly.

    #3. Copper dissolves in nitric acid, producing copper (ll) nitrate.

    After reaction with sodium hydroxide and heating, copper nitrate changes to copper (ll) oxide.

    Calculate the percent yield of this process if 1.235 g of copper produced 1.235 g of copper oxide. Show your calculations.

    © BrainMass Inc. brainmass.com September 24, 2022, 7:28 pm ad1c9bdddf
    https://brainmass.com/chemistry/redox-reactions/balancing-redox-reaction-calculating-percent-yield-205732

    SOLUTION This solution is FREE courtesy of BrainMass!

    Please see the file attached for solution.

    #2. Balance the redox equation for the reaction of Cu and HNO3 giving
    NO2 directly.
    At anode,
    Cu ---> Cu2+ + 2e-
    at cathode,
    2e- + 4H+ + 2NO3- -----> 2H2O + 2NO2

    now, add both the half reactions together

    Cu + 4H+ + 2NO3- ------> 2H2O + 2NO2 + Cu2+

    #3. Copper dissolves in nitric acid, producing copper (ll) nitrate.
    After reaction with sodium hydroxide and heating, copper nitrate changes to copper (ll)
    oxide. Calculate the percent yield of this process if 1.235 g of copper
    produced 1.235 g of copper oxide. Show your calculations.
    Cu + HNO3 → CuNO3
    CuNO3 + NaOH → CuO + NaNO3 + ½ H2

    Now, from equation, we can see that
    1 mol Cu : 1mol CuO
    Therefore, 1.235 g Cu / 63.54 g/mol : 1.235 g Cu / 63.54 *1 mol CuO
    hence, theoretical expected amount of CuO = 0.01944 mol CuO
    or in grams, mass of expected CuO = 0.01944 x 79.54 g/mol(molar mass) =1.546 g CuO
    now, %yield = 9actual yield/theoretical yield) *100
    = (1.235 / 1.546)*100 = 79.87% yield.

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

    © BrainMass Inc. brainmass.com September 24, 2022, 7:28 pm ad1c9bdddf>
    https://brainmass.com/chemistry/redox-reactions/balancing-redox-reaction-calculating-percent-yield-205732

    Attachments

    ADVERTISEMENT