Question

When the following equation is balanced, the coefficient of Al is ___ Al (s) + H20 (1) - Al(OH)3 (s) + H2 (g) A) 4 B) 1 C) 5 D) 3 E) 2

Answer 1

Answer: The correct answer is Option E.

Explanation:

Every balanced chemical equation follows law of conservation of mass.

This law states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form.  

This also means that total mass on the reactant side must be equal to the total mass on the product side.

The balanced chemical equation for the reaction of aluminium and water follows:

$2Al(s)+6H_2O(l)\rightarrow 2Al(OH)_3(s)+3H_2(g)$

The coefficient of Aluminium is 2.

Hence, the correct answer is Option E.