Suppose you are asked to identify an unknown element based on its spectrum, and you see that it has a bright yellow line at 587 nanometers, a bright green line at 557 nanometers, and multiple blue or violet lines between 425-450 nanometers. Based on your observations and the spectra you have seen throughout this activity, what is the unknown element most likely to be

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 is b that is the answer.

the objects have the same charge is correct.

nathan lee