Gas Calculations

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

  Volume = moles × 24
• Why does the equation for gas volume work for any type of gas?

  Because the relationship between moles and volume is consistent across different gases
• If you have 3.5 moles of chlorine gas, what is the volume it occupies?

  84 decimeters cubed
• How do you find the number of moles from a given volume of gas?

  Divide the volume by 24
• What is the number of moles in 60 decimeters cubed of oxygen?

  1. 5 moles
• What is the first step to find the volume of 27 grams of water vapor?

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

  18
• How many moles are in 27 grams of water vapor?

  1. 5 moles
• What is the volume of 1.5 moles of water vapor?

  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 many moles of nitrogen are in 18 decimeters cubed?

  0.75 moles
• How do you find the moles of ammonia produced from nitrogen?

  Use the molar ratio from the balanced equation
• If the molar ratio of nitrogen to ammonia is 1:2, how many moles of ammonia are produced from 0.75 moles of nitrogen?

  1. 5 moles of ammonia
• What is the volume of 1.5 moles of ammonia?

  36 decimeters cubed
• What is the molar ratio between nitrogen and hydrogen in the reaction?

  1. 3
• How much hydrogen would react with 4 decimeters cubed of nitrogen?

  12 decimeters cubed
• Under what conditions does the equation with the number 24 apply?

  At room temperature and pressure
• What happens to gas volume if temperature or pressure changes?

  The volume of gas changes
• Why is the equation with the number 24 important for exams?

  It is the only equation needed for gas volume calculations