0.80 mol MgBr2 is added to 1.00 kg water. Determine the freezing point of the solution. Water has a freezing point depression constant of 1.86°C•kg/mol. Which equation should you use?

the answers would be

the first one and the second one

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.