Respuesta :
Answer:
[tex]\Delta H_{rxn}=-847.6\ KJ/mol.[/tex]
Explanation:
The balanced chemical equation is:
[tex]2Al(s)+Fe_2O_3(s)-->Al_2O_3+2Fe(s)[/tex]
Now, standard values of [tex]\Delta H_f\ of\ all\ participants\ of\ reaction.[/tex]
[tex]\Delta H_f(Al_2O_3)=-1669.8\ KJ/mol\\\Delta H_f(Fe_2O_3)=-822.2\ KJ/mol\\\Delta H_f(Al(s))=0\ KJ/mol\\\Delta H_f(Fe(s))=0\ KJ/mol\\[/tex]
Now, We know [tex]\Delta H_{rxn}=\Delta H_{products}-\Delta H_{reactants}[/tex]
Putting all values of [tex]\Delta H_f[/tex] to above equation.
We get,
[tex]\Delta H_{rxn}=-847.6\ KJ/mol.[/tex]
Hence, this is the required solution.
-847.6 kJ/mol is heat of formation or heat change for the given thermite reaction.
What is exothermic reaction?
Those reactions which releases heat during a chemical reaction is known as exothermic reaction.
Given chemical reaction is:
2Al(s) + Fe₂O₃(s) → Al₂O₃(s) + 2Fe(s) and heat of formation is calculated as:
ΔH⁰ = ΔH⁰ₓ - ΔH⁰ₙ, where
ΔH⁰ₓ = heat of formation of product
ΔH⁰ₙ = heat of formation of reactant
At standard condition heat of formation of reactants and products are listed below:
Al₂O₃ = -1669.8 kJ/mol
Fe₂O₃ = -822.2 kJ/mol
Fe & Al = 0
So, ΔH⁰ = -1669.8 - (-822.2) = -847.6 kJ/mol
Hence, heat of formation or heat change for the given reaction is -847.6 kJ/mol.
To know more about exothermic reaction, visit the link:
https://brainly.com/question/2924714
