Why is the formation of solid sodium chloride from solid

Chapter 9, Problem 10E

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QUESTION:

Problem 10E

Why is the formation of solid sodium chloride from solid sodium and gaseous chlorine exothermic, even though it takes more energy to form the Na+ ion than the amount of energy released upon formation of Cl- ?

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QUESTION:

Problem 10E

Why is the formation of solid sodium chloride from solid sodium and gaseous chlorine exothermic, even though it takes more energy to form the Na+ ion than the amount of energy released upon formation of Cl- ?

ANSWER:

Solution 10E Step 1 of 1 We have to spend a certain amount of energy (called energy of ionization) to make a metal (e.g. Sodium) lose its electron, When an electron join a non metal, the non metal releases a certain amount of energy (called electronic affinity) Thus we have to spend energy to make the Na lose

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