Homework Help: Chemistry

Posted by Riley on Sunday, March 18, 2012 at 8:47pm.

A 500g iron (Fe) rod was left in air for a long period of time, and got covered with rust (Fe2O3) as a result of reaction with atmospheric oxygen. The mass of the rusty rod was determined as 560g.

a) calculate the theoretical yield of Fe2O3(s), that is the mass of Fe2O3(s) that would form if all Fe reacted. For your convenience, molecular weights of Fe and Fe2O3 are 55.845 g/mol and 159.69 g/mol, respectively.
b)calculate the mass of Fe2O3(s) in the rusty rod?

My work:

a.) Fe= 55.845/500g= 0.11169
Fe2O3= 159.69/560=0.285

I'm stuck on what to do next.

Also I don't get how to do part b.

Please help Thanks!

Chemistry - Riley, Sunday, March 18, 2012 at 8:48pm
there's a part c that I didn't know how to do either...

c) Calculate the actual percent yield of Fe2O3(s)
Chemistry - DrBob222, Sunday, March 18, 2012 at 9:37pm
4Fe + 3O2 => 2Fe2O3

mols Fe = 500 g/atomic mass Fe = ?
Use the equation to convert mols Fe to mols Fe2O3. That will be
mols Fe x (2 mols Fe2O3/4 mol Fe) = ?mols Fe x (1/2) = ?? This is theoretical yield.
Grams Fe2O3 = mols x molar mass
%yield = (actual yield/theoretical yield)*100 = ?

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