# GChem Question

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

1. ### 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 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 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.

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