(3.45 x 10^20 molecules of sulfur dioxide ) x

= 5.73x10^-4 mole of sulfur dioxide
<span>When carbon dioxide is passed through water, some of it dissolves. A small fraction of the dissolved CO2 interacts with the water to become carbonic acid, H2CO3.</span>
Hydrogen bonding is important in many chemical processes. Hydrogen bonding is responsible for water's unique solvent capabilities. Hydrogen bonds hold complementary strands of DNA together, and they are responsible for determining the three-dimensional structure of folded proteins including enzymes and antibodies
The answer is “H2O2” .....
Http://www.chem4kids.com/files/elem_pertable.html this should help.