The reaction of H2 and I2 to form HI is exothermic. The heat of reaction is -21 kcal. When the temperature is increased, the equilibrium will
Correct: A
The reaction is exothermic, so the heat of reaction is -21 kcal. This means that heat is evolved during the reaction. When the temperature is increased, the reaction will shift to the left, as the system tries to absorb heat and reduce the temperature