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Question

The value of the equilibrium constant for the reaction
H2(g)+I2(g)2HI(g)
at 720K is 48. What is the value of the equilibrium constant for the following reaction?
12H2(g)+12I2(g)HI(g)

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Solution

Solution:-
H2(g)+I2(g)2HI(g)
K=[HI]2[H2][I2]=48.....(i)
12H2(g)+12I2(g)HI(g)
K=[HI][H2]12[I2]12
Squring both sides we have,
K2=[HI]2[H2][I2]
K2=48[From (i)]
K=48=43
Hence, for the reaction 12H2(g)+12I2(g)HI(g), the value of equillibrium constant is 43.

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