Thread: Molar Mass problem

How many moles of O atoms are in 2.03 mol of Fe_2_O_3_, the primary component of iron-based rust?

I need to do this problem in dimentional analysis, but have no idea how to do it? I've tried this problem for 20 minutes and I still can't get things to cancel out.

Thank you for any help!

Ok, I solved this problem with some more work on it. However, this is how I got my answer:

2.03mol Fe_2_O_3_(3molO/1molFe_2_O_3)(48gO/1molO)(1molO/48gO)

From that I got the answer. Now, I realize that last step is redundant, but it's the only way I could get back to moles, and it worked. But, was there a better way to do this problem?

And I have another question. I'd start a new thread, but the question in this one I really answered myself, lol.

What is the mass in grams?
0.663 μmol potassium hypoiodite