Gas calculations

• What is the equation that links gas volume to moles?

  Volume = moles × 24
• What does the equation for gas volume apply to?

  Any type of gas, like chlorine or oxygen
• How do you calculate the volume of 3.5 moles of chlorine gas?

  3.5 × 24 = 84 decimeters cubed
• How do you find moles from a volume of 60 decimeters cubed of oxygen?

  60 ÷ 24 = 2.5 moles
• What is the first step to find the volume of 27 grams of water vapor?

  Find the moles using mass and relative formula mass
• What is the relative formula mass (Mr) of water (H2O)?

  18
• How do you calculate moles from 27 grams of water vapor?

  27 ÷ 18 = 1.5 moles
• What is the volume of 1.5 moles of water vapor?

  1.5 × 24 = 36 decimeters cubed
• What is the limiting reagent in a reaction with excess hydrogen and 18 decimeters cubed of nitrogen?

  Nitrogen is the limiting reagent
• How do you find moles of nitrogen from 18 decimeters cubed?

  18 ÷ 24 = 0.75 moles
• How do you determine the moles of ammonia produced from nitrogen?

  Use the molar ratio of nitrogen to ammonia
• What is the molar ratio of nitrogen to ammonia?

  1:2
• How many moles of ammonia are produced from 0.75 moles of nitrogen?

  0.75 × 2 = 1.5 moles
• What is the volume of 1.5 moles of ammonia?

  1.5 × 24 = 36 decimeters cubed
• What is the shortcut for converting gas volumes in reactions?

  Use the molar ratio directly
• How much hydrogen reacts with 4 decimeters cubed of nitrogen?

  4 × 3 = 12 decimeters cubed
• When does the equation with the number 24 apply?

  Only for gases at room temperature and pressure
• What happens to gas volume if temperature or pressure changes?

  It changes the volume occupied by the gas
• What is the key takeaway from the video regarding gas volume calculations?

  Use the equation with 24 for gases
• What are the steps to find the volume of a gas from its mass?

  1. Calculate moles using mass and Mr.
  2. Use the equation: Volume = moles × 24.
• What is the process for finding the volume of a product from a reactant's volume?

  1. Identify the limiting reagent.
  2. Calculate moles of the limiting reagent.
  3. Use the molar ratio to find moles of product.
  4. Convert moles of product to volume using the equation.