stuck on a hw questino?

Question

I tried this problem but the program said i had the wrong answer


Complete and balance each of the following equations for gas evolution reactions. (Type your answer using the format CO2 for CO2. Use the lowest possible coefficients.)


(a) ______HClO4(aq) + ______K2CO3 = ______ (g) + ______(l) + ______ (aq)

(b) ______HC2H3O2(aq) + ______ LiHSO3(aq) = ______(g) + (l) + ______(aq)

(c) ______(NH4)2SO4(aq) + ______Ca(OH)2(aq) = ______(s) + ______ (g) + ______ (l)

(d) ______HCl(aq) + ______ZnS(aq) = ______(g) + ______(aq)

Answer 1

_2_HClO4(aq) + __K2CO3 = __ CO2(g) + __H2O(l) + _2_ KClO4(aq)

__HC2H3O2(aq) + __ LiHSO3(aq) = __SO2(g) + __H2O(l) + __LiC2H3O2(aq)

__(NH4)2SO4(aq) + __Ca(OH)2(aq) = __CaSO4(s) + _2_NH3 (g) + _2_H2O (l)

_2_HCl(aq) + __ZnS(aq) = __H2S(g) + __ZnCl2(aq)

Answer 2

a.) 2,1, CO2, H2O, 2KClO4
???
c.) 1, 1, CaSO4 (s) 2NH3 (g) + (H20)
d.) 2,1, H2S, ZnCl2

these things are hard to do on computers, and i cant remember all of their formal state (s, l, aq)