The relationship between enthalpy change ($\Delta H$) and internal energy change ($\Delta E$ or $\Delta U$) is given by $\Delta H = \Delta E + p\Delta V$. For systems consisting of only solids and/or liquids, the change in volume ($\Delta V$) is negligible. Therefore, $p\Delta V \approx 0$, which makes $\Delta H \approx \Delta E$ .