According to the first law of thermodynamics, what could happen when heat is added to a system?

i have no clue hope you find the answer

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.

it’s previous models   because when i picked that son of a gun’s answer it was wrong look for previous models because they might make it a different letter