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  4. 4.5 moles each of hydrogen and iodine were heated in a sealed ten litre vessel. At equilibrium 3 moles of HI were found. The equilibrium constant for H2(g) +I2(g) is

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Q. $4.5 \,moles$ each of hydrogen and iodine were heated in a sealed ten litre vessel. At equilibrium 3 moles of HI were found. The equilibrium constant for
$H_{2(g)} +I_{2(g)}$ is

Equilibrium

Solution:

$2\, moles$ of $HI$ are formed from $1\, mole$ of $H_2$ and $I_2$.
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$K=\frac{\left[Hi\right]^{2}}{\left[H_{2}\right]\left[I_{2}\right]}=\frac{\left(3\right)^{2}}{3\times3}=1$