Using Moles to Balance Equations

• What is the main topic of the video?

  Using moles to balance chemical equations
• What is the purpose of balancing chemical equations?

  To ensure the conservation of mass in a chemical reaction
• What is the relative formula mass of hydrogen?

  2
• How many moles of hydrogen are present in 2 g of hydrogen?

  1 mole
• What is the relative formula mass of chlorine?

  71
• How many moles of chlorine are present in 71 g of chlorine?

  1 mole
• What is the relative formula mass of hydrogen chloride?

  36.5
• How many moles of hydrogen chloride are present in 73 g of hydrogen chloride?

  2 moles
• What is the method to find the lowest possible ratio of moles?

  Divide all mole numbers by the smallest number
• What is the lowest possible ratio of 1, 1, and 2?

  1, 1, 2
• Why do we not write the number one in chemical equations?

  It is convention to omit the number one
• What is the mass of aluminium used in the second example?

  54 g
• What is the mass of iron(II) oxide used in the second example?

  216 g
• What is the mass of aluminium oxide produced in the second example?

  102 g
• What is the mass of iron produced in the second example?

  168 g
• How many moles of aluminium are present in 54 g of aluminium?

  2 moles
• How many moles of iron(II) oxide are present in 216 g?

  3 moles
• How many moles of aluminium oxide are produced?

  1 mole
• How many moles of iron are produced?

  3 moles
• What is the smallest number in the second example for calculating ratios?

  1
• What is the ratio of moles for the second example after dividing by the smallest number?

  2, 3, 1, 3
• What is the mass of barium chloride in the final example?

  1,248 g
• What is the mass of aluminium sulfate in the final example?

  684 g
• What is the mass of barium sulfate produced in the final example?

  1,398 g
• What is the mass of aluminium chloride produced in the final example?

  534 g
• How many moles of barium chloride are present in 1,248 g?

  6 moles
• How many moles of aluminium sulfate are present in 684 g?

  2 moles
• How many moles of barium sulfate are produced?

  6 moles
• How many moles of aluminium chloride are produced?

  4 moles
• What is the smallest number for calculating ratios in the final example?

  2
• What is the ratio of moles for the final example after dividing by the smallest number?

  3, 1, 3, 2
• What is the method for balancing chemical equations using moles?

  1. Calculate the number of moles of each substance.
  2. Divide by the smallest number of moles to find the simplest ratio.
  3. Write the balanced equation using these ratios.
  4. Omit the number one in the final equation.
• What are the key steps to follow when balancing more complicated equations?

  • Calculate moles for each reactant and product.
  • Determine the lowest ratio by dividing by the smallest mole number.
  • Use these ratios to balance the equation.
• What resources are available for further practice on balancing equations?

  • Vision workbook available through the provided link.