Question
Asked Oct 26, 2019
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Use standard enthalpies of formation to determine ΔHorxnfor:

2Al(s) + 3Cl2(g) → 2AlCl3(s)

Enter in kJ.

 

Find the change in internal energy for this reaction. Enter in kJ.

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Expert Answer

Step 1

Given:

2Al(s) + 3Cl2(g) → 2AlCl3(s)

Step 2

Calculation for ΔHo of reaction:

ΔΗρ(product) -ΔΗΡ (reactant)
ΔΗΡΚ
Ε
rxn
гxn
rxn
ΔΗΡ
2x ΔΗΡ(AICI,)-(3 x ΔΗΡ Cl,) + 2 x ΔΗΡ(Al)
rxn
гxn
ΔΗΡ2(-705.63) -(3(0) + 2(0) )
rxn
-1411.26 KJ/mol
ΔΗΡΚη
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ΔΗρ(product) -ΔΗΡ (reactant) ΔΗΡΚ Ε rxn гxn rxn ΔΗΡ 2x ΔΗΡ(AICI,)-(3 x ΔΗΡ Cl,) + 2 x ΔΗΡ(Al) rxn гxn ΔΗΡ2(-705.63) -(3(0) + 2(0) ) rxn -1411.26 KJ/mol ΔΗΡΚη

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Step 3

Relation between heat of reacti...

ΔΗΡ
ΔU + ΔnRT
rxn
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ΔΗΡ ΔU + ΔnRT rxn

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Chemical Thermodynamics

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