# Chemisrty

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A 38 g sample of iron ore is treated as follows.
The iron in the sample is all converted by
a series of chemical reactions to Fe2O3. The
mass of Fe2O3 is measured to be 11.1 g. What
was the mass of iron in the sample of ore?

• Chemisrty -

Another stoichiometry problem BUT there is a short cut that saves a lot of time; however, the shortcut is not taught, to my knowledge, anymore.
Here is the short cut.
grams Fe in the ore = grams Fe2O3 x (2*atomic mass Fe/molar mass Fe2O3) = ?

• Chemisrty -

6.93755

• Chemisrty -

not quite sure how to do this how do i get an answer through this thing

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