N2O4(g) <-> 2 NO2(g)
N204 gas will break down to form NO2 gas as represented by the chemical equation above. When a sample of N20, is added to a flask at 400 K the pressure is measured to be 1.0 atm. After the system comes to equilibrium the pressure in the flask is measured to be 1.5 atm. What is the value of the equilibrium constant, Kp, for the reaction?

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.

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.