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 Delta {H}for the reaction, what additional information do you need to determine ΔE Delta {E} for the process?

FREE Expert Solution

Internal Energy:


E=q+w


Recall that work (w) is given by:


w=-PΔV


• (+): heat, q is gained by the system (i.e. endothermic rxn )

• (–): heat, q is released by the system (i.e. exothermic rxn)


• (+): work is done by the surroundings to the system (compression)

• (–): work is done by the system to the surroundings (expansion)


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?

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