Q.

The electron gain enthalpy of chlorine is 3.7eV. How much energy in Kcal is released when 2g of chlorine atoms is completely converted to Cl- ions in the gaseous state? (1eV/atom=23.06 Kcal/mole)

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answer is 3.

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Detailed Solution

Given Clg→Cl-g, ∆H=-3.7×23.03 kCals;35.5g gaseous chlorine releases 3.7(23.06)k Cal2g gaseous chlorine releases =4.8 kCal/mole
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The electron gain enthalpy of chlorine is 3.7eV. How much energy in Kcal is released when 2g of chlorine atoms is completely converted to Cl- ions in the gaseous state? (1eV/atom=23.06 Kcal/mole)