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K(p)=0.04 atm at 899K for the equilibriu...

`K_(p)=0.04` atm at `899K` for the equilibrium shown below. What is the equilibrium concentration of `C_(2)H_(6)` when it is placed in a flask at `4.0` atm pressure and allowed to come to equilibrium ?
`C_(6)H_(6)(g)hArrC_(2)H_(4)(g)+H_(2)(g)`

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