Thanks in advance!

Balance the Equation: Ba (s) + "2" HOH (aq) >>>Ba(OH)2 (aq) + H2

this is the correct equation. A general way to balance equations is solving a set of equations:

a Ba + b H

_{2}O --> c Ba(OH)

_{2} + d H2

Now:

Ba --> a = c

H --> 2b = 2c + 2d

O --> b = 2c

Now use substitution to get b = 2c

Now all variables are dependent on c thus we take c = 1 for the lowest coefficients. It automatically follows a = 1, b = 2, c = 1 and d = 1.