4.42 grams of sulfur dioxide are mixed with excess water. The reaction yields 3.73 grams of sulfurous acid (H2SO3). SO2 (g) + H2O (l) H2SO3 (g)

(1) What is the theoretical yield of sulfurous acid (H2SO3)?
grams
(2) What is the percent yield for this reaction?

Explanation for basic character?

Choose an equation that represents an enzyme-catalyzed reaction. (a) enzyme + substrate → enzyme-substrate complex (b) enzyme + substrate ←−→ enzyme + products (c) enzyme + substrate ←−→ enzyme-substrate complex → enzyme + products (d) enzyme + substrate ←−→ enzyme-substrate complex → enzyme-substrate complex + products

I'm learning about the periodic tables and what each subject's configuration is. for example, hydrogen is 1s^1, but i don't understand how you get that. can someone me understand how to figure out how to figure this out? sorry if the question makes no sense, but it would really a lot if you could me understand! you so much if you can!