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Q.

Magnitude of electron gain enthalpy of Iodine is 296 kJ/mole. Energy released when 12.7 grams of iodine vapours completely convert to gaseous iodide ions will be

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a

14.8 kJ

b

59.2 kJ

c

29.6 kJ

d

7.4 kJ

answer is C.

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Detailed Solution

Ig+e-→I-g , ∆egH =-296 kJ ; At.wt of Iodine = 127 ; 127 g release 296 kJ. 12.7 g release 'X' kJ. 'X' = 29.6 kJ ;
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Magnitude of electron gain enthalpy of Iodine is 296 kJ/mole. Energy released when 12.7 grams of iodine vapours completely convert to gaseous iodide ions will be