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Based on Hess's law calculations, what is the average bond energy of $S-O$ in $SO_3$ if $\Delta H_f^o$ of $SO_3$ is $-270\, kJ\,mol^{-1}$. Bond energy of $O=O$ is $130\, kJ\,mol^{-1}$ and heat of sublimation for $S(s)$ is $100\, kJ\, mol^{-1}$ ? .....$kJ\,mol^{-1}$

• ✓
  $188.5$
• B
  $120$
• C
  $12$
• D
  $100$