A student ran the following reaction in the laboratory at 581 K: COCl2(g) CO(g) + Cl2(g) When he introduced COCl2(g) at a pressure of 0.872 atm into a 1.00 L evacuated container, he found the equilibrium partial pressure of Cl2(g) to be 0.390 atm. Calculate the equilibrium constant, Kp, he obtained for this reaction. Kp =

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

what is the question here. i think you messed up.