.

• What is the recipe for making one sandwich in the sandwich shop?

  2 slices bread + 1 slice meat + 1 slice cheese → 1 sandwich
• How many slices of bread, meat, and cheese did you have to make sandwiches?

  8 slices bread, 8 slices meat, and 5 slices cheese
• How many sandwiches can you make with 8 slices of bread?

  4 sandwiches
• How many sandwiches can you make with 8 slices of meat?

  8 sandwiches
• How many sandwiches can you make with 5 slices of cheese?

  5 sandwiches
• What is the limiting reactant when making sandwiches with the given ingredients?

  Bread is the limiting reactant
• What happens when you run out of one ingredient while making sandwiches?

  You must stop making sandwiches
• What is the formula for the ideal gas law mentioned in the study material?

  PV = nRT
• What happens to the pressure in a vessel when the number of gas particles increases?

  The pressure increases
• How does the number of molecules of gas change during the reaction of H₂ and N₂ to form NH₃?

  The number of molecules of gas decreases
• What does the van't Hoff equation calculate?

  The change in the equilibrium constant with temperature
• What is the integrated form of the van't Hoff equation?

  ln K2/K1 = -ΔH°/R (1/T2 - 1/T1)
• If K1 is 6.8 × 10^5 at 298 K, what is K2 at 600 K if ΔH° is -91.8 kJ/mol?

  K2 = 6.1 × 10^13
• What is the partial pressure of N₂ when 100 mol of NH₃ dissociates into 50 mol of N₂ and 150 mol of H₂?

  0.25 atm
• How do you calculate the equilibrium constant K for the reaction involving NH₃, N₂, and H₂?

  K = (0.50)^2 / (0.25)(0.75)^3
• What is the equilibrium constant K when 100 mol of NH₃ dissociates?

  K = 1.185
• How many moles of N₂ are produced when 2 mol of NH₃ decomposes at 1000 K?


  1 mol of N₂
• How do you calculate ΔH° for the reaction N₂(g) + 3H₂(g) ⇌ 2NH₃(g) using equilibrium constants?

  By using the equilibrium constants at two different temperatures
• What is the partial pressure of NH₃ when 2 mol of NH₃ decomposes and 1.827 mol of N₂ is produced?

  • 0.177 atm
• What are the steps to determine the limiting reactant using reactant quantities?

  1. Identify the quantities of each reactant.
  2. Use stoichiometry to calculate the maximum number of products that can be formed from each reactant.
  3. The reactant that produces the least amount of product is the limiting reactant.
• What is the relationship between temperature and the equilibrium constant according to the van't Hoff equation?

  • The equilibrium constant changes with temperature.
  • The standard enthalpy change (ΔH°) is assumed to be independent of temperature over small ranges.
  • The van't Hoff equation allows calculation of this change.
• What are the key components of the van't Hoff equation?

  • ln K2/K1 = -ΔH°/R (1/T2 - 1/T1)
  • K1 and K2 are equilibrium constants at temperatures T1 and T2.
  • R is the gas constant.
• What is the significance of the equilibrium constant in chemical reactions?

  • It indicates the ratio of products to reactants at equilibrium.
  • It varies with temperature and can be calculated using the van't Hoff equation.
  • It helps predict the direction of the reaction.