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Question
Find the bond enthalpy of S−S bond from the following data:
C2H5−S−C2H5;ΔHof=−147 kJ mol−1
C2H5−S−S−C2H5;ΔHof=−201.9 kJ mol−1
S(g)−ΔHof=−222.8 kJ mol−1
C2H5−S−C2H5;ΔHof=−147 kJ mol−1
C2H5−S−S−C2H5;ΔHof=−201.9 kJ mol−1
S(g)−ΔHof=−222.8 kJ mol−1
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Solution
ΔH=∑(BE)R−∑(BE)P
(i) −147.2= Heat of atomization of 4C,10H,1S−BE of 10(C−H),2(C−S),2(C−C)
(ii) −201.9= Heat of atomization of 4C,10H,1S−BE of 10(C−H),2(C−S),2(C−C),(S−S)
Subtracting (i) from (ii)
BE of (S−S)=227.5kJ
(i) −147.2= Heat of atomization of 4C,10H,1S−BE of 10(C−H),2(C−S),2(C−C)
(ii) −201.9= Heat of atomization of 4C,10H,1S−BE of 10(C−H),2(C−S),2(C−C),(S−S)
Subtracting (i) from (ii)
BE of (S−S)=227.5kJ
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