Gas Calculations

• What does the equation link in gas volume calculations?

  Volume of gas to moles of gas
• What is the equation to find the volume of a gas?

  Volume = moles × 24
• How do you calculate the volume of 3.5 moles of chlorine gas?

  3.5 × 24 = 84 decimeters cubed
• What is the volume of 60 decimeters cubed of oxygen in moles?

  60 divided by 24 equals 2.5 moles
• How do you find the volume from 27 grams of water vapor?

  First find moles, then use volume equation
• What is the relative formula mass (Mr) of water (H2O)?

  18
• How do you calculate moles from mass and Mr?

  Moles = mass / Mr
• 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?

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

  18 divided by 24 equals 0.75 moles
• What is the molar ratio of nitrogen to ammonia?

  1 to 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 molar ratio between nitrogen and hydrogen?

  1 to 3
• 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 with changing temperature or pressure?

  Gas volume changes with temperature or pressure
• What is the key takeaway from the video regarding gas volume calculations?

  Use the equation with 24 for gases