First slide

Relation between Delta H and Delta U

Question

Statement I : For a reaction 2NH_3(g) → N_2(g) + 3H_2(g); ΔH > ΔE .
Statement II : Enthalpy change is always greater than internal energy change.

Easy

A

Statement I and Statement II are true.
B

Statement I is true and statement II is false.
C

Statement I is false and Statement II is true.
D

Statement I and Statement II are false.

Solution

$\begin{array}{l} \Delta H = \Delta E + \Delta {n_g}RT\\ If\,\,\,\Delta {n_g} > 0\,\,\,\,\,Then\,\,\,\Delta H > \Delta E\\ If\,\,\,\,\Delta {n_g} = 0\,\,\,\,\,Then\,\,\,\Delta H = \Delta E\\ If\,\,\,\Delta {n_g} < 0\,\,\,\,\,Then\,\,\,\Delta H < \Delta E \end{array}$
For given reaction ,
$\Delta n_g=(1+3)-2=2$
Enthalpy change depends on change in number of gaseous moles of a given reaction at given Temperature

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