For the homogeneous reaction $4 N H_{3} (g) + 5 O_{2} (g) ⇋ 4 N O (g) + 6 H_{2} O (g)$ the equilibrium constant $K_{c}$ has the unit of:

(c o n c)^{- 1}

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c o n c

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(c o n c)^{+ 10}

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it is dimensionless

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Solution

The correct option is B $c o n c$
The unit of the equilibrium constant $K_{c}$ is $(m o l e / l i t r e)^{Δ n}$ .
Here, $Δ n$ is the difference in the total number of gaseous products and the total number of gaseous reactants.
For the reaction $4 N H_{3} (g) + 5 O_{2} (g) ⇋ 4 N O (g) + 6 H_{2} O (g)$ , $Δ n = 4 + 6 - (4 + 5) = 1$ .
Hence, the unit of the equilibrium constant $K_{c}$ will be $(m o l e / l i t r e)^{Δ n} = (m o l e / l i t r e)^{1} = c o n c$ .

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For the homogeneous reaction 4NH3(g)+5O2(g)⇋4NO(g)+6H2O(g) the equilibrium constant Kc has the unit of:

For the homogeneous reaction $4 N H_{3} (g) + 5 O_{2} (g) ⇋ 4 N O (g) + 6 H_{2} O (g)$ the equilibrium constant $K_{c}$ has the unit of: