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If $\Delta H$ is the change in enthalpy and $\Delta E$ the change in internal energy accompanying a gaseous reaction

• A
  $\Delta H$ is always greater than $\Delta E$
• B
  $\Delta H < \Delta E$ only if the number of moles of the products is greater than the number of the reactants
• C
  $\Delta H$ is always less than $\Delta E$
• ✓
  $\Delta H < \Delta E$ only if the number of moles of the products is less than the number of moles of the reactants