Chemistry

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The oxides of Group 2A metals (symbolized by M here) react with carbon dioxide according to the following reaction:
MO(s) + CO2(g)  MCO3(s)
A 2.85-g sample containing only MgO and CuO is placed in a 3.00-L container. The container is filled with CO2 to a pressure of 740. torr at 20.°C. After the reaction has gone to completion, the pressure inside the flask is 390. torr at 20.°C. What is the mass percent of MgO in the mixture? Assume that only the MgO reacts with CO2.

  • Chemistry -

    The CO2 pressure drops from 740 torr to 390 torr; the difference is the pressure of CO2 that reacted and that converted to atm ((740-390)/760 = ?atm
    Use PV = nRT to solve for mols CO2.
    MgO + CO2 ==> MgCO3.
    mols CO2 = mols MgO and that x molar mass = grams MgO.
    %MgO = (grams MgO/mass sample)*100 = ?

  • Chemistry -

    71.6%

  • Chemistry -

    81.3%

  • Chemistry -

    (740-390)/760=.46Atm
    .46atm(3.0K)=n(.08206)(293.15k)
    1.38=n(24.056)
    n=.054 mols CO2
    mols CO2=mols MgO
    g/.054mol=40.31mm of MgO
    g=2.177g MgO
    2.177gMgO/2.85g total samp
    =76.4percent

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