Calculate ΔHrxn for the following reaction: Fe2O3(s)+3CO(g)→2Fe(s)+3CO2(g) Use the following reactions and given ΔH values: 2Fe(s)+32O2(g)→Fe2O3(s),ΔH CO(g)+12O2(g)→CO2(g),ΔH==−824.2kJ−2 82.7kJ

Answer : The value of is, -23.9 kJ

Explanation :

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

The main reaction is,

The intermediate balanced chemical reaction will be,

(1)    

(2)    

We are reversing reaction 1 and multiplying reaction 2 by 3 and then adding all the equations, we get :

(1)    

(2)    

The expression for enthalpy of the reaction is:

Therefore, the value of is, -23.9 kJ

your answer would be “dry”

a electronegativity decreases beacuse the size of nucleus is bigger.