When the equation Al (OH) ₃ + H₂SO₄ - --> Al₂ (SO₄) ₃ + H₂O is balanced, the sum of the balancing coefficients is

A. 5

B. 7

C. 11

D. 12

The answer to your question is the letter D. 12

Explanation:

Unbalanced chemical reaction

Al (OH) ₃ + H₂SO₄ ⇒ Al₂ (SO₄) ₃ + H₂O

Reactants Elements Products

1 Al 2

1 S 3

5 H 2

7 O 13

Balanced chemical reaction

2Al (OH) ₃ + 3H₂SO₄ ⇒ Al₂ (SO₄) ₃ + 6H₂O

Reactants Elements Products

2 Al 2

3 S 3

12 H 12

18 O 18

Sum up the coefficients

Result = 2 + 3 + 1 + 6

= 12