Ionization Energy, Electron Affinity and Enthalpy Ionization Energy, Electron Af

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Ionization Energy, Electron Affinity and Enthalpy

Ionization Energy, Electron Affinity, and Enthalpy The following reaction can be written as the sum of two reactions, one of which relates to ionization energy and one of which relates to electron affinity: Na(g) + Cl(g) Na+(g) + Cl- (g) The ionization energy for sodium is +496 kJ/mol. The electron affinity for chlorine is -349 kJ/mol. Use these values and Hess's law to calculate the enthalpy for the following reaction: Na(g) + Cl(g) rightarrow Na+(g) 4- Cl(g), delta H = ? Express your answer numerically in kilojoules.

Explanation / Answer

delta H = +496 -349 = 147 kJ it is positive because everytime a gas energy is released more when the ionic solid forms.

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