Question

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/mol

2 Fe(s) + 3/2 O2(g) → Fe2O3(s) ΔH = -824.2 kJ/mol

C(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/mol

N2O5(g) + H2O(l) → 2 HNO3(l) ΔH = -76.6 kJ/mol

1/2 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)