Question

SO2 + H2O +_ H2SO3
I need to know how to balance simple direct combination reactions

Answer 1

Hi so first of all count the number of atoms on both sides.
S = 1
O = 2

H = 2, O = 1

H = 2, S = 1, O = 3

Have a go at multiplying and seeing if you can get each atom to have the same number.