Question 13 of 69intermediate🔧 ApplyShort Answer2 marks

The equilibrium constant expression for a gas reaction is,

Kc=[NH3]4[O2]5[NO]4[H2O]6K_c = \frac{[NH_3]^4 [O_2]^5}{[NO]^4 [H_2O]^6}

Write the balanced chemical equation corresponding to this expression.

Correct Answer

The balanced chemical equation corresponding to the given expression is:

4NO(g)+6H2O(g)⇌4NH3(g)+5O2(g)4NO(g) + 6H_2O(g) \rightleftharpoons 4NH_3(g) + 5O_2(g)
Exercise: EXERCISES | Q: 6.13 | (Page 42)
For More Understanding

Explanation

The given equilibrium constant expression is Kc=[NH3]4[O2]5[NO]4[H2O]6K_c = \frac{[NH_3]^4 [O_2]^5}{[NO]^4 [H_2O]^6}. In an equilibrium expression, the concentrations of the products are placed in the numerator and the concentrations of the reactants are in the denominator. The stoichiometric coefficients in the balanced equation become the powers of the concentration terms. Here, the products are NH3NH_3 and O2O_2 with coefficients 4 and 5, while the reactants are NONO and H2OH_2O with coefficients 4 and 6. This corresponds to the reverse of the standard formation of NO from ammonia.

Solution Steps

  1. Step 1: Identify the products and reactants from the given KcK_c expression. The numerator contains the products [NH3]4[NH_3]^4 and [O2]5[O_2]^5, and the denominator contains the reactants [NO]4[NO]^4 and [H2O]6[H_2O]^6.

  2. Step 2: Use the powers of the concentration terms as the stoichiometric coefficients for the respective species in the balanced equation.

  3. Step 3: Write the balanced chemical equation with reactants on the left and products on the right: 4NO(g)+6H2O(g)⇌4NH3(g)+5O2(g)4NO(g) + 6H_2O(g) \rightleftharpoons 4NH_3(g) + 5O_2(g).

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