The electron affinity of chlorine is +37eV. How much energy in kJ is released when 3.55g of chlorine is converted completely into Cl ion in the gaseous state . (1eV=96.49kJ/mole)
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Solution
Given, Cl(g)+e−→Cl−(g)+37eV
Energy released when 1 mole (35.5g) of chlorine atoms change completely into Cl−(g)=37×96.49kJ=3570.13kJ/mol
Energy released when 3.55g of chlorine atoms change completely into Cl−(g)=(3570.13/35.5)×3.55=357.013kJ