Count the significant digits in each of these measurements: measurement number of significant digits −×2.010−3kJ/mol 72600.kg 0.007700J ×5.710−1mL

it's all four options.

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.