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At $298.2\, \mathrm{~K}$ the relationship between enthalpy of bond dissociation (in $\mathrm{kJ} \,\mathrm{mol}^{-1}$ ) for hydrogen $\left(\mathrm{E}_{\mathrm{H}}\right)$ and its isotope, deuterium $\left(\mathrm{E}_{\mathrm{D}}\right)$, is best described by:

• A
  $E_{H}=\frac{1}{2} E_{D}$
• B
  $E_{H}=E_{D}$
• C
  $E_{H}=2 E_{D}$
• ✓
  $E_{H} \simeq E_{D}-7.5$