Chemistry 9701 · AS & A Level · Chemical energetics

Chemical energetics — practice question

In solid sulfur, the particles are molecules containing eight atoms joined together by covalent bonds. In sulfur dioxide, the bonding arrangement is $\text{O}=\text{S}=\text{O}$. Information: - Enthalpy change of combustion of $\text{S}_8$, $\Delta H_c^\circ(\text{S}_8(s)) = -2376\,\text{kJ mol}^{-1}$ - Energy needed to separate $1$ mole $\text{S}_8(s)$ into gaseous atoms $= 2232\,\text{kJ mol}^{-1}$ - $\text{O}=\text{O}$ bond enthalpy $= 496\,\text{kJ mol}^{-1}$ From these data, what is the value of the $\text{S}=\text{O}$ bond enthalpy?

  • A$239\,\text{kJ mol}^{-1}$
  • B$257\,\text{kJ mol}^{-1}$
  • C$319\,\text{kJ mol}^{-1}$
  • D$536\,\text{kJ mol}^{-1}$

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