Which of the following correctly defines the molar volume of an ideal gas at standard temperature and pressure (STP)?

• A. The volume occupied by one mole of an ideal gas at 100°C and 2 atm.
• B. The volume occupied by one liter of an ideal gas at STP.
• C. The volume occupied by one mole of an ideal gas at 0°C and 1 atm, which is 22.4 L.
• D. The volume occupied by one gram of an ideal gas at 25°C and 1 atm.

Answer: (C)

Verified step by step guidance

1. Understand the definition of molar volume: it is the volume occupied by one mole of a substance (in this case, an ideal gas) under specified conditions of temperature and pressure.
2. Recall the standard temperature and pressure (STP) conditions, which are defined as 0°C (273.15 K) and 1 atm pressure.
3. Recognize that the molar volume of an ideal gas at STP is a well-known constant, approximately 22.4 liters per mole.
4. Evaluate each option by checking if it matches the definition of molar volume at STP: it must refer to one mole of gas at 0°C and 1 atm.
5. Conclude that the correct definition is the volume occupied by one mole of an ideal gas at 0°C and 1 atm, which corresponds to about 22.4 liters.