What is TRUE about the law of conservation of energy? A. heat is lost during a chemical reaction
B. heat is gained during a chemical reaction
C. heat is neither gained or lost during a chemical reaction
D. heat is unable to be measured during a chemical reaction

c

Explanation:

i would say b

explanation:

but i think i would need more information than that

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.