Question

For the following homogeneous reaction, the equilibrium constant K has units as:

${4NH}_3+{5O}_2\rightleftharpoons 4NO+{6H}_{2}O$

• A. ${conc.}^{+10}$
• B. ${conc.}^{+1}$
• C. ${conc.}^{-1}$
• D. $dimensionless$

Answer 1

Answer: (B)

${conc.}^{+1}$

Given reaction is,

$4N{H}_3+5O_2\rightleftharpoons 4NO+6H_{2}O$

Equilibrium constant will be $K_p=\frac{{\left[NO\right]}^4{\left[H_{2}O\right]}^6}{{\left[N{H}_3\right]}^4\left[O_2\right]}$

For each term, units of concentration are conc.

Units for equilibrium constant will be $\frac{{(conc.)}^4{(conc.)}^6}{{(conc.)}^4{(conc.)}^5}=\left[\right(conc.){]}^{+1}$

So, the correct option is $B$.