Chemistry (PLZ HELP)

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Aluminium can be produced by the thermal decomposition of aluminium oxide. What mass of aluminium would be produced from 3.5kg of aluminium oxide?

  • Chemistry (PLZ HELP) -

    Aluminium oxide: Al2O3.
    Molecular mass (approx.)=27*2+3*16=102
    Aluminium:
    Al
    Molecular mass=27.

    Write down the equation:
    2Al2O3 -> 4Al + 3O2 (electrolysis)

    So
    2 Al2O3 molecules -> 4 Al molecules.
    2*102 Al2O3-> 4*27 Al
    204 : 108

    Use proportion to solve for the final answer (substitute the exact atomic masses)

  • Chemistry (PLZ HELP) -

    There is nothing wrong with the solution by MathMate of this hypotehtical question. However, I just don't believe Al2O3 will decompose thermally to Al/

  • Chemistry (Dr. Bob) -

    Quite right Dr.Bob. Thank you for the note.
    It just doesn't decompose like that. Carbon is required to reduce the oxide.
    Namely
    2Al2O3+3C -> 4Al + 3CO2
    The electrolysis part is more to help prevent the formation of CO.
    However, as you said, the ratio of Al and Al2O3 does not change.

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