An equilibrium mixture of H2, I2 and HI at 458 C contains 0.112 molH2, 0.112 mol I2, and 0.775 molHI in a 5.00-L vessel. A) What are the equilibrium partial pressure of HI when equilibrium is reestablished following the addition of 0.200 mol of HI? B) What are the equilibrium partial pressure of I2 when equilibrium is reestablished following the addition of 0.200 mol of HI? C) What are the equilibrium partial pressure of H2 when equilibrium is reestablished following the addition of 0.200 mol of HI?