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Problem: 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 change in enthalpy for the following reaction per mole of reagent:Na(g) + Cl(g) → Na+(g) + Cl−(g) ΔH = ?Express your answer with the appropriate units.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)

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Problem Details

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 change in enthalpy for the following reaction per mole of reagent:

Na(g) + Cl(g) → Na+(g) + Cl(g) ΔH = ?

Express your answer with the appropriate units.


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)

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Born Haber Cycle concept. You can view video lessons to learn Born Haber Cycle. Or if you need more Born Haber Cycle practice, you can also practice Born Haber Cycle practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor McFarlane's class at University of Manitoba.