Need chemistry help with grams > moles problem.

Chemistry
Tutor: None Selected Time limit: 1 Day

"Calculate how many moles of Uranium are found in 100.0 g of carnotite, K2(UO2)2(VO4)2*3H20.

MW Carnotite = 902.14 g/mol, MW Uranium = 476.06

I understand that to go from g > moles you divide by molecular weight (476.06). When I do, 100.0g/902.14 = .1108475403...what do I do about sig figs here? 1 x10e-1?

If that's right, I'm so confused on how to isolate the # of moles of Uranium now. 

The professor wants us to convert the found # of moles > grams, as well.

Thanks for help in advance!

Sep 13th, 2015

Thank you for the opportunity to help you with your question!

moles of carnonite = moles of U2

moles of carnonite = 100g/902.14 = 0.11085 ( to 5 significant figures

moles of U2 = 0.11085 moles

MW of U2 = 476.06

mass of uranium (U2) = 476.06 *0.11085 = 52.77g


Please let me know if you need any clarification. I'm always happy to answer your questions.
Sep 13th, 2015

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