InterviewSolution
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InterviewSolution
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The bond dissociation energies for`Cl_(2),I_(2)` and ICIare 242.3,151.0 and211.3 `kJ // ` mole respectively . The enthalpy of sublimation of iodine is62.8 kJ `//` mole.What is the standard enthalpy of formation ofICI(g) nearly equal to ?A. `- 211.3 kJ //`moleB. `- 14.6kJ //`moleC. 16.8 kJ`//` moleD. `33.5 kJ//` mole |
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Answer» Correct Answer - C We aim `: (1)/(2) I_(2)(s) + (1)/(2) Cl_(2) (g) rarr ICI (g) ` We are given `:` (i) `Cl_(2)(g)rarr 2Cl(g), DeltaH=242.3 kJ` (ii) `I_(2)(g) rarr 2I(g),DeltaH = 151 kJ` (iii) `ICI (g) rarr (i) + Cl(g), DeltaH =211.3 kJ` (iv) `I_(2)(s) rarrI_(2)(g), DeltaH =62.8 kJ` `(1)/(2) (ii) (1)/(2) (i)- (iii) +(1)/(2) ` gives the required equation with `DeltaH =(1)/(2) (151) +(1)/(2) (292.3) -211.3 + (1)/(2) (62.8) = 16.75kJ` |
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