# Problem: Assume that the following reaction occurs at constant pressure:2 Al(s) + 3 Cl2(g) → 2 AlCl3(s)(a) If you are given ΔH for the reaction, what additional information do you need to determine ΔE for the process?(b) Which quantity is larger for this reaction?

###### FREE Expert Solution

Internal Energy:

$\overline{){\mathbf{∆}}{\mathbf{E}}{\mathbf{=}}{\mathbf{q}}{\mathbf{+}}{\mathbf{w}}}$

Recall that work (w) is given by:

$\overline{){\mathbf{w}}{\mathbf{=}}{\mathbf{-}}{\mathbf{P\Delta V}}}$

At constant P → q = ΔH (enthalpy)

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###### Problem Details

Assume that the following reaction occurs at constant pressure:
2 Al(s) + 3 Cl2(g) → 2 AlCl3(s)

(a) If you are given ΔH for the reaction, what additional information do you need to determine ΔE for the process?

(b) Which quantity is larger for this reaction?