Chemical equilibrium — Question 5

QUESTIONS 4–5

Questions 4–5 refer to the decomposition of hydrogen iodide gas (HI) to produce hydrogen gas (H₂) and iodine gas (I₂) in a sealed 1-litre container.

$∆\mathrm{H}\,=\,+\text{53.6 kJ mol}^{-1}$

2HI(g)

H₂(g)

I₂(g) +

Colourless

Colourless

Purple

QUESTION 5

Determine the equilibrium expression (K_c ) for the reaction.

[ ][ ] H I 2 2

(A) $\mathrm{K}=$ c [ ] 2 HI

[ ][ ] H I 2 2

(B) $\mathrm{K}=$ c 2 [ ] HI

[ ] [ ] 2 H 2 I

(C) $\mathrm{K}=$ c [ ] 2 HI

[ ] [ ] 2 H 2 I $\mathrm{K}=$

(D) c 2 [ ] HI