Thermodynamics and Thermochemistry
11.0 Relationship Between $?H$ and $?E$
11.0 Relationship Between $?H$ and $?E$
(1) For liquids and solids
$\Delta V = 0{\text{ }}W = 0{\text{ }}\left( {{\text{change in volume is almost negligible}}} \right)$
$\Delta H = \Delta E$
(2) For gaseous state
$$PV = nRT$$
$$P\Delta V = \Delta n\left( g \right)RT$$
$$\Delta H = \Delta E + \left( {\Delta n} \right)RT$$
(a)
$$\Delta {n_g} = 0: - {\text{ }}\Delta H = \Delta E$$
(b)
$$\Delta {n_g} = - Ve: - {\text{ }}\Delta H < \Delta E$$
(c)
$$\Delta {n_g} = + Ve: - {\text{ }}\Delta H > \Delta E$$
