Element X has two isotopes. If 98.90% of the element has an isotopic mass of 12.00 amu, and 1.10% of the element has an isotopic mass of 13.01 amu. Calculate the average atomic mass for this element and identify the element. Use a stylus, pencil (if using a chromebook), or finger to solve the problem in the space below. (1 point work, 1 point answer, 1 point sig figs, 1 point units, and 1 point for correct element identified)

(0.9890)(12.00)+(1.10)(13.01)

Explanation:

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.