How to convert each quantity into Moles of Sulfur??? HELP!!!?

I must round off correctly and ahow calculation setup. I did a few on my own, but these are a little complicated for me.


Any help would be appreciated.





1.) 2 moles of SnS2?





2.) 3.01 times 10 to the 23rd power molecules of H2S?





3.) How many grams of O in 2.10 moles of H3PO4(aq)?





4.) How many moles of H in 1.20 moles of H3PO4(aq)?





5.) How many moles is 49.00 grams of H3PO4(aq)? How


many molecules is that?





6.) Okay, for this one, I did the first part of it which is:





Convert 5.40 grams of boron to moles? The answer I got


was 0.500 mol of B(Boron) right?





Now the next part says:





How many atoms of boron is that? So, I multiply 6.02


times 0.500 mol B and the answer I got was 3.10 times


ten to the 23rd power?





Thanks!

How to convert each quantity into Moles of Sulfur??? HELP!!!?
There are many ways of finding the infomation you want, and I have included the links you will need to help you. Of course, in addition to this, you can also use the resources at your local library, they are only too happy to help you with your searches and queries.





http://www.google.com





http://www.wikipedia.org/





http://uk.search. yahoo.com/web





http://find articles.com/





http://vos.ucsb.edu/ index.asp





http://www.aresearch guide.com/





http://www.geocities.com/athens /troy/886...





http://www.studentresearcher. com/search/...





http://www.cha cha.com/

frangipni