Complete and balance these chemical equations....?

Question

K+BaCl2=?? SeO3+H2O=?? SnCl2(aq)+Na2S(aq)=??

Answer 1

1 K + 1 BaCl2 => 2KCl & 1 Ba (assuming there is no water, & reaction is run with the melted solids)

1 SeO3 + 1 H2O =>1 H2SeO4

(p.s. 1 SeO2 &  1 H2O would make 1 H2SeO3)

1 SnCl2(aq) + 1 Na2S(aq) => 1 SnS(s) & 2 NaCl