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

I must round off correctly and show the 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!!!!!!?
2 moles of SnS2 contain 2x2 = 4 moles of S





3.01x10^23 molecules / 6.02x10^23 moles/mole = 0.500 moles of S





2.10 moles H3PO4 x 4 moles of O/moles of H3PO4 x 16 g/mole of O atoms = 134.4 g O atoms





1.20 moles of H3PO4 x 3 moles of H per mole of H3PO4 =3.60 moles of H atoms





49 grams of H3PO4 / 98 g H3PO4 per mole = 0.50 moles of H3PO4





5.40 g B / 10.81 g per mole = 0.500 moles


0.500 moles x 6.02x10^23 atoms/mole = 3.01x10^23 atoms
Reply:One time I popped my mole and it smelled like sulfur.