Question

the electron affinity of chlorine is -3.7 EV how much energy in KJ is released when 7.1 gram of chlorine is converted completely into CL minus ion in the gaseous state

Answer 1

Answer:

-72 kJ

Electon Affinity = -3.7 eV / atom (because defined in eV )

= -3.7 × 1.6 × 10^-19 x 10^-3 kJ

= -5.9 x 10-22 kJ / atom

= -5.9 x 10-22 x 6 x 10^23 kJ/mol

= -360 kJ/mol

Moles of Cl taken = 7.1/35.5 = 0.2 mol

So total energy released = EA x moles

= -360 x 0.2 = -72 kJ