Posted by Anan on Tuesday, February 23, 2010 at 9:38pm.
The book is right.
ALL of these problems can be worked this way.
1. Write and balance the equation.
2. Convert what you have (in this case Fe) to moles. moles = grams/molar mass= ??.
3. Using the coefficients in the balanced equation, convert moles of what you have into moles of what you want (in this case Fe2O3).
moles Fe2O3 = moles Fe x (1 mole Fe2O3/2 moles Fe) = moles Fe x 1/2 = ??
4. Convert moles of what you have to the units you want (in this case grams). grams = moles x molar mass.
I get 679.0756 g which rounds to 679 to three significant figures (the number 675 limits you to 3 s.f.).
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