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Energy Levels

9. The elect...

Question

9. The electron gain enthalpy of chlorine is -349 kJ mol^-1. How much energy in kJ is released when 3.55g of chlorine is converted completely into Cl^- ion in the gaseous state?

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Solution

Cl + e^- â†’ Cl^-
1 mole of Chlorine atom = 35.5 g of Chlorine
35.5 g of Chlorine releases -349 kJ/mol of energy in gain of one electron, to from chloride ion.
Therefore, 3.55 g of chlorine will release (-349x3.55)/35.5 = -34.9 kJ/mol of energy.

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