1.

Find the enthalpy of S-S bond from the following data. Report your answer by multiplying `1.08/100` (i)`C_2H_5-S-C_2H_5(g) " " DeltaH_f^(2)=-147.2kJ//mol` (ii)`C_2H_5-S-S-C_2H_5(g) " " DeltaH_f^(@)=-201.9 kJ//mol` (iii)`S(g) " "DeltaH_f^(@)=222.8kJ//mol`

Answer» Correct Answer - 3 kJ/mol
`C_2H_5-S-C_2H_5+StoC_2H_5-S-S-C_2H_5`
`DeltaH_f^(@)(C_2H_5-S-C_2H_5)=DeltaH_f^(@)(C_2H_5-S-S-C_2H_5)-DeltaH_(s-s)+DeltaH_(sub)S`
-201.9= -147.2-`DeltaH_(s-s)` +222.8
`DeltaH_(s-s)`=277.5 kJ/mol


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