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The electron gain enthalpy of chlorine i...

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

Text Solution

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According to the definition of electron gain enthalpy .
`CI (g) + e^(-) ( g) to CI^(-) ( g) + 349 kJ mol^(-1)`
`:.` Energy released when 1 mole (= 35.5 g ) of chlorine atoms change completely into `CI^(-)` ( g) =349 kJ
Energy released when 3.55 g of chlorine atoms change completely into `CI^(-) ( g) = (349)/(35.5) xx 3.55 = 34.9 kJ`
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