Consider the following reaction: 2NO(g)+Br2(g)⇌2NOBr(g) ,Kp=28.4 at 298 K

In a reaction mixture at equilibrium, the partial pressure of NO is 117 torr and that of Br2 is 126 torr. What is the partial pressure of NOBr in this mixture?

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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.