1. Calculate the work (in kJ) when 3.00 moles of hydrogen gas are produced from the reaction of sodium in excess water at 298 K:

2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)

2. Calculate w (in kJ) when 379 g iron (III) oxide (MM = 159.7 g/mol) reacts with excess carbon to produce carbon dioxide gas at 429 K:

2Fe2O3(s) + 3C(s) → 4Fe(s) + 3CO2(g)

3. Calculate the work (in kJ) when 2.60 moles of methane react with excess oxygen at 494 K:

CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)

4. A reaction at 3.04 atm consumes 1.20 L of a gas. Calculate the change in internal energy of the system (in kJ).

5. A reaction at 1.76 atm produces 22.8 L of a gas and evolves 71.0 kJ of heat (exothermic). Calculate the change in internal energy of the system (in kJ).