The value of Kp for the reaction is 89.0 at 875 °C. What is the equilibrium partial pressure of HI in a sealed reaction vessel at 875 °C if the initial partial pressures of H2 and I2 are both 0.210 atm and initially there is no HI present?

A1.50-liter sample of dry air in a cylinder exerts a pressure of 3.00 atmospheres at a temperature of 25°c. without changing the temperature, a piston is moved in the cylinder until the pressure in the cylinder is reduced to 1.00 atmospheres. the volume of the gas is