Question

Calculate Hrxn for the following reaction at 25.0 oC: Fe3O4(s) + CO(g) -- 4 points > 3Fe(s) + CO2(g) Given: AHfo (kJ/mol) of Fe3O4(s) =-1118. CO(g) = -110.5, FeO(s) = -272 and CO2 = -393.5 109 kJ -263

Answer 1

To calculate the enthalpy change for the given reaction, we can use Hess's law and the enthalpy of formation values provided. The reaction can be broken down into two steps, and the enthalpy changes for each step can be calculated using the given values. By adding and subtracting these values, we can determine the enthalpy change for the overall reaction.

Step-by-step explanation:

To calculate the enthalpy change (ΔHrxn) for the given reaction, we can use Hess's law and the enthalpy of formation values (AHfo) provided. The balanced chemical equation for the reaction is Fe3O4(s) + CO(g) --> 3Fe(s) + CO2(g). We can break down this reaction into two steps:

Step 1: Fe3O4(s) --> 3FeO(s) (AHfo = -1118 kJ)

Step 2: 3FeO(s) + CO(g) --> 3Fe(s) + CO2(g) (AHrxn)

By adding the AHfo values of Fe3O4(s) and CO(g) and subtracting the AHfo value of FeO(s), we can calculate the AHrxn for Step 1. Similarly, by adding the AHfo values of FeO(s) and CO2(g), we can calculate the AHrxn for Step 2.

Using the given AHfo values of Fe3O4(s), CO(g), FeO(s), and CO2(g), we can calculate the enthalpy change for the overall reaction.