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GChem Question

Discussion in 'DAT Discussions' started by tom_servo_dds, Jul 22, 2006.

  1. tom_servo_dds

    tom_servo_dds Senior Member
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    found this one on Topscore that I don't understand the answer to.

    Q: What are the products of the balanced equation when iron (III) oxide reacts with magnesium chloride?

    A:
    A) FeCl3, Mg2O
    B) FeCl2, MgO
    C) FeCl3, MgO
    D) Fe2Cl3, MgO
    E) Fe3Cl2, Mg2O

    Answer key says that it's C because "Fe2O3 + MgCl2 ==> FeCl3 MgO"

    However, this isn't a balanced equation as the problem asks for. Anyone have any thoughts? I've been studying for about 14 hours today so maybe I'm just going cross-eyed again. Thanks in advance!
     
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  3. dat_student

    dat_student Junior Member
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    The problem says "Iron (iii)" so the right answer is either A or C

    A) FeCl3, Mg2O
    C) FeCl3, MgO

    MgCl2 tells me the valence of Mg = 2 & we know the valence of O = 2
    so MgO is the right answer. [Mg2O means Oxygen has a valence of 4 << WRONG]

    Thus, C is the only right answer. :)
     
  4. slayerdeus

    slayerdeus Member
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    Don't confuse yourself man, stay focused. The question is not asking for the balanced equation, only which products are formed. Goodluck.
     
  5. tom_servo_dds

    tom_servo_dds Senior Member
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    Great, thanks for the answer you two - that makes sense now. Best of luck to both of you too! :)
     

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