What is P: (in atm) of a system at 323 K of the following two gases? P, =.0725 atm and
P2 =100. mm Hg if collected over water?

i just learnt this recently but i need to look through my notes again

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.