Answer
a) Ba(ClO$_{3}$)$_{2}$ (s) --> BaCl$_{2}$(s) + 3O$_{2}$(g)
b) 2PbS(s) + 3O$_{2}$(g) --> 2PbO(s) + 2SO$_{2}$(g)
Work Step by Step
a) Ba(ClO$_{3}$)$_{2}$ (s) --> BaCl$_{2}$(s) + 3O$_{2}$(g)
b) 2PbS(s) + 3O$_{2}$(g) --> 2PbO(s) + 2SO$_{2}$(g)