Question

For which of the following ∆U = ∆H?

Options

• \[\ce{N2O4_{(g)} ⇌ 2NO2_{(g)}}\]

• \[\ce{2SO2_{(g)} + O2_{(g)} ⇌ 2SO3_{(g)}}\]

• \[\ce{H2_{(g)} + Cl2_{(g)} ⇌ 2HCl_{(g)}}\]

• \[\ce{H2_{(g)} + 1/2O2_{(g)} ⇌ H2O_{(l)}}\]

Answer 1

\[\ce{H2_{(g)} + Cl2_{(g)} ⇌ 2HCl_{(g)}}\]

Explanation:

∆U = ∆H when ∆n = 0

In the equation,

\[\ce{H2_{(g)} + Cl2_{(g)} ⇌ 2HCl_{(g)}}\],

∆n = 0,

∴ ∆U = ∆H