Question 1
Iron is made from a reaction of iron oxide with carbon monoxide in the following reaction:
Fe2O3(s) + 3 CO(g) → 2 Fe(s) + 3 CO2(g)
Using Hess' Law, calculate the enthalpy of reaction given:
C(s) + O2(g) → CO2(g) ΔH = -393.5 kJ/mol2 Fe(s) + 3/2 O2(g) → Fe2O3(s) ΔH = -824.2 kJ/molC(s) + 1/2 O2(g) → CO(g) ΔH = -110.5 kJ/mol
Question 2
Use Hess' Law to calculate enthalpy of reaction for the following equation:
2 N2(g) + 5 O2(g) → 2 N2O5(g)
Given:
2 H2(g) + O2(g) → 2 H2O(l) ΔH = -571.6 kJ/molN2O5(g) + H2O(l) → 2 HNO3(l) ΔH = -76.6 kJ/mol1/2 N2(g) + 3/2 O2(g) + 1/2 H2(g) → HNO3(l) ΔH = -174.1 kJ/mol
Question 3
Using standard enthalpies of formation, determine the ΔHreaction for the following equations:
2 CH3OH(l) + 3 O2(g) → 2 CO2(g) + 4 H2O(g)
Standard Enthalpies of Formation in ΔHf (kJ/mol) CO(g)-110.5
CO2(g)-393.5
CH3OH(l)-238.4
H2O(g)-241.8