Question

Open the Balancing Chemical Equations interactive and select Introduction mode. Then choose Separate Water. Adjust the coefficients until the equation is balanced.
What is the balanced chemical equation for the decomposition of water?
Open the Balancing Chemical Equations interactive and select Introduction mode. Then choose Make Ammonia. Adjust the coefficients until the equation is balanced.
What is the balanced chemical equation for the formation of ammonia?

Answer 1

$H_2O + H_2 + O_2$

Explanation:

1. Water decomposition

• Decomposition reactions are represented by-

       The general equation: AB → A + B.

• Various methods used in the decomposition of water are -

1. Electrolysis
2. Photoelectrochemical water splitting
3. Thermal decomposition of water
4. Photocatalytic water splitting

• Water decomposition is the chemical reaction in which water is broken down giving oxygen and hydrogen.

• The chemical equation will be -

        $H_2O + H_2 + O_2$

Hence, balancing the equation we need to add a coefficient of 2 in front of $H_2O$ on right-hand-side of the equation and  2 in front of $H_2$ on left-hand-side of the equation.

     ∴The balanced equation is -

       $2 H_2O$ → $2 H_2 + O_2$

2. Formation of ammonia

• The formation of ammonia is by reacting nitrogen gas and hydrogen gas.

      $N_2 + H$ → $NH_3$

Hence, for balancing equation we need to add a coefficient of 3 in front of hydrogen and 2 in front of ammonia.

   ∴The balanced chemical equation for the formation of ammonia gas is as  follows -

     $N_2+3H$→ $2NH_3$.

• When 6 moles of $N_2$ react with 6 moles of$H_2$ 4 moles of ammonia are produced.