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Given K(a) values of 5.76xx10^(-10) and ...

Given `K_(a)` values of `5.76xx10^(-10)` and `4.8xx10^(-10)` for `NH_(4)^(+)` and HCN respectively. What is the equilibrium constant for the following reaction?
`NH_(4)^(+)(aq.)+CN^(-)(aq.)hArrNH_(3)(aq.)+HCN(aq.)`

A

`0.83`

B

`1.2`

C

`8.0xx10^(-11)`

D

`27.6xx10^(-10)`

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