The difference between $\Delta \mathrm{H}$ and $\Delta \mathrm{U}$ is usually significant for systems…
The difference between $\Delta \mathrm{H}$ and $\Delta \mathrm{U}$ is usually significant for systems consisting of:
only solids
only gases
only liquids
both solids and liquids
Solution
The difference between \(\Delta H\) and \(\Delta U\) is not usually significant for systems consisting of only solids or liquids. Solids and liquids do not suffer any significant volume changes upon heating. The difference, however, becomes significant when gases are involved.