Chemistry

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One mole of N2 and three moles of H2 are placed in a flask at 375 C. Calculate the total pressure of the system at equilibrium if the mole fraction of NH3 is 0.21. The Kp for the reaction is 4.31*10^4.

I assume this to be the reaction
N2 + 3H2 --> 2NH3

Help ?

Forgot to mention: Final answer is 50 atm

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