Hydrogen iodide is added to an evacuated reaction vessel. The vessel is sealed and warmed. A
decomposition reaction occurs. Hydrogen and iodine are formed. Some hydrogen iodide remains.
When equilibrium is established, the total pressure is $1.20 \times {10^5}Pa$. The partial pressure of hydrogen is $4.00 \times {10^3}Pa$.
Hydrogen iodide, hydrogen and iodine are all gaseous under the conditions used.
What is the value of ${K_p}$ for the equilibrium at this temperature, assuming the decomposition is the forward reaction?
1 )
$1.19 \times {10^{-3}}$
$1.28 \times {10^{-3}}{\text{ }}$
3 )
$1.38 \times {10^{-3}}$
4 )
$1.43 \times {10^{-3}}$
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