Which of the following is a properly balanced equation

a. 12 Al4C3 + H2O -> 3CH4 + 4Al(OH)3

b. Al4C3 + 12H2O -> 3CH4 +4Al(OH)3

c. Al4C3 + H2O -> CH4 + Al(OH)3

d. Al4C3 + 6H2O -> 3CH4 + 2Al(OH)3

thanks in advance!

B

At a glance, you know that answers a, c, and d are incorrect. Each of them has a different number of Al atoms on each side (48 versus 4, 4 versus 1, and 4 versus 2).

To confirm that answer b is balanced: Total up the carbon atoms, the hydrogen atoms, and the oxygen atoms on each side. If those atom counts match on both sides, the equation is balanced.