What is the mole fraction of hi in the mixture

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Question- Hydrogen gas and iodine gas form hydrogen iodide. If .500 mol H2 and 1.00 mol I2 are placed in a closed 10.0 L vessel, what is the mole fraction of HI in the mixture when equilibrium is reached at 205 degrees C? Use appendix C and any reasonable approximations to obtain K.

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