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Working with Kp and Kc

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2NOBr(g) + Br2(g) <----> 2BrNO(g) @ equilibrium. NOBr is 34% dissociated at 25degreesC and total pressure is 0.25 atm.
Calculate Kp and Kc.

I know how to get Kp and Kc with given # of moles @ equilibrium, but cannot figure out how to get it from the percent dissociation. I tried inputting various values that I thought were correct for that percentage, but I got different answers each time. Thanks!!!

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2NOBr(g) + Br2(g) <----> 2BrNO(g)

........ 2 .... 1 ........ 0 .....initial conc. ...

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