CP1 Measuring the Molar Volume of a Gas

• At STP, the molar volume of all gases is approximately 22.4 L/mol.


  True
• Knowing the molar volume allows us to convert between the amount of a gas in moles and its volume in liters.
• The conical flask in the experimental setup is submerged in a water bath to maintain a constant temperature.


  True
• If the lab temperature differs from STP, the gas volume must be adjusted using the Ideal Gas Law.
• Match the equipment with its purpose:

  Gas syringe ↔️ Collect and measure gas volume

  Conical flask ↔️ Hold reactants

  Water bath ↔️ Maintain constant temperature
• To calculate the experimental molar volume, use the formula: Measured gas volume / Number of moles
• If the measured gas volume is 25.0 L and the number of moles is 1.12 mol, the experimental molar volume is 22.3 L/mol
• The molar volume of all gases at STP is exactly 22.4 L/mol.

  False
• To measure the molar volume of a gas, a water bath is used to maintain a constant temperature
• What is the approximate molar volume of all gases at STP?

  22.4 L/mol
• The molar volume of all gases at STP is exactly 22.4 L/mol.

  False
• The conical flask in the experimental setup is placed inside a water bath to maintain a constant temperature.
• How can temperature fluctuations be minimized during the reaction?

  Maintain constant water bath
• The molar volume is the volume occupied by 1 mole of a gas at STP.
• Steps to measure gas volume accurately:

  1️⃣ Set up the conical flask and water bath

  2️⃣ React metal and acid

  3️⃣ Collect gas in gas syringe

  4️⃣ Adjust volume for STP conditions
• Match the term with its definition:

  Number of moles ↔️ Amount of substance in moles

  Mass ↔️ Amount of matter

  Molar mass ↔️ Mass of one mole of a substance
• The formula to determine the number of moles of gas is n = m / M.
• The molar volume is the volume occupied by 1 mole of a gas at STP.


  True
• The molar mass is the mass of one mole
• What is the molar mass of hydrogen gas (H₂)?

  2 g/mol
• If 5 grams of H₂ have a molar mass of 2 g/mol, the number of moles is 2.5


  True
• To determine the number of moles of gas generated, use the formula n = m / M
• Match the term with its definition:

  Number of moles ↔️ Amount of substance in moles

  Mass ↔️ Amount of matter

  Molar mass ↔️ Mass of one mole of a substance
• At STP, the molar volume of all gases is approximately 22.4 L/mol
• At STP, the molar volume of hydrogen gas is 22.4 L/mol.

  True
• To measure the molar volume of a gas, one piece of equipment needed is a gas syringe
• Steps for measuring gas volume in an experiment:

  1️⃣ Prepare the conical flask in the water bath

  2️⃣ React metal and acid

  3️⃣ Collect gas in the gas syringe

  4️⃣ Record the final volume
• If the experimental molar volume is close to 22.4 L/mol at STP, the gas behaves ideally.


  True
• Steps to measure the gas volume accurately

  1️⃣ Set up the conical flask in the water bath

  2️⃣ React metal and acid

  3️⃣ Collect gas in syringe

  4️⃣ Record volume
• What does the term 'Molar mass' refer to?

  Mass of one mole
• The measured gas volume is the volume of gas collected in the gas syringe.
• The experimental molar volume of a gas can be compared to 22.4 L/mol at STP to confirm ideal behavior.

  True
• What is the theoretical molar volume of a gas at STP?

  22.4 L/mol
• To minimize gas leaks in the experimental setup, use tight fittings and conduct leak checks.
• Reading the gas volume at eye level helps to avoid parallax errors.


  True
• Incomplete reactions can be avoided by adding excess reactant if necessary.