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Kp for the reaction 2SO3(g) +O2(g) left...

`K_p` for the reaction `2SO_3(g) +O_2(g) leftrightarrow 2SO_3(g)` is `2.5 times 10^20 atm^-1` at 500K. Calculate the `K_p` for the reaction `SO_3(g) leftrightarrow SO_2(g)+1/2 O_2(g)`.

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`6.3 times 10^-6 atm^0.5`
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