Answer:
ΔH°rxn = -47 kJ
Explanation:
Using Hess´s law for the reaction:
3 Fe2O3(s) + CO(g) → 2 Fe3O4(s) + CO2(g) ,
the ΔH°rxn will be given by the expression:
ΔH°rxn kJ = 2ΔHºf(Fe3O4) + ΔHºf(CO2) - ( 3ΔHºf(Fe2O3) + ΔHºf(CO) )
= 2(-1118) + (-394) - ( 3( -824 ) + ( -111 ) )
= - 47 kJ
Answer:
ΔH°rxn = - 47 KJ/mol
Explanation:
∴ ΔH°f Fe2O3(s) = - 824 KJ/mol
∴ ΔH°f Fe3O4(s) = - 1118 KJ/mol
∴ ΔH°f CO(g) = - 111 KJ/mol
∴ ΔH°f CO2(g) = - 394 KJ/mol
⇒ ΔH°rxn = [ΔH°f CO2(g) + 2 ΔH°f Fe3O4(s)] - [ΔH°f CO(g) + 3 ΔH°f Fe2O3(s)]
⇒ ΔH°rxn = [- 394 KJ/mol + 2(- 1118 KJ/mol)] - [(- 111 KJ/mol) + 3(- 824 KJ/mol)
⇒ ΔH°rxn = - 2630 KJ/mol - (- 2583 KJ/mol)
⇒ ΔH°rxn = - 47 KJ/mol
