The following problems are gas-phase equilibria problems that usually require some calculations to determine the pre-equilibrium conditions. When you are done with each problem close the window to return to this menu.

• Problem (1): NO_{2 (g)} N₂O_{4 (g)} (unbalanced)
  
  
• Problem (2): CaCO_{3 (s)} CaO_(s) + CO_{2 (g)}
  
  
• Problem (3): C_(s) + H₂O_(g) CO_(g) + H_{2 (g)}