Question

At a certain temp. 2HI ⇌ H₂ + I₂ Only 50% HI is dissociated at equilibrium. The equilibrium constant is.

• A. 0.25
• B. 1.0
• C. 3.0
• D. 0.50

Answer 1

Answer: (A)

0.25

Answer 2

$2 H I$ 100 50⇌ $\begin{array} { r r } H _ { 2 } & + I _ { 2 } \\ 0 & 0 \\ 25 & 25 \end{array}$

$\frac { \left[ \mathrm { H } _ { 2 } \right] \left[ \mathrm { I } _ { 2 } \right] } { [ \mathrm { HI } ] ^ { 2 } } = \frac { 25 \times 25 } { 50 \times 50 } = 0.25$ .