Balance each equation
11. KOH(aq) + HBr(aq) → KBr + H20(0)
12. H2CO3 (aq) → + CO2 (g) H20
13. Na (s) + O2 (g) → Na2O (s)
14. Al(OH)3(aq) + H2CO3(aq) → Al2(CO3)3 + H2O
15. Al (s) + S8 (s) → AIS (s)
16. Cs (s) + N2 (g) → Cs3N (s)
17. Mg (s) + Cl2 (g) → MgCl2 (s)
18. Rb (s) + RbNO3 → Rb20 (s) + N2 (g)
19. C.H. (0) + O2 (g) → CO2 (g) + H20 (g)
20. N2 (g) + H2 (g) → NH3(g)