1. What Is Molar Volume?

Molar volume is the volume occupied by one mole of a substance at a given temperature and pressure. For ideal gases at standard temperature and pressure (STP: 0°C, 1 atm), the molar volume is 22.4 L/mol.

2. How Does the Calculator Work?

The calculator uses the molar volume formula:

Where:

• \( V_m \) — Molar volume (L/mol)
• \( V \) — Volume of gas (L)
• \( n \) — Number of moles (mol)

Explanation: At STP (0°C, 1 atm), one mole of any ideal gas occupies 22.4 liters. This relationship is derived from the ideal gas law.

3. Importance of Molar Volume

Details: Molar volume is fundamental in stoichiometric calculations for gases, determining gas densities, and converting between moles and volume in chemical reactions involving gases.

4. Using the Calculator

Tips: Enter the number of moles and volume in liters. For STP calculations, set temperature to 0°C and pressure to 1 atm. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the standard molar volume at STP?
A: The standard molar volume for ideal gases at STP (0°C, 1 atm) is exactly 22.4 L/mol.

Q2: Does molar volume change with temperature and pressure?
A: Yes, according to the ideal gas law (PV = nRT), molar volume increases with temperature and decreases with pressure.

Q3: Is 22.4 L/mol exact for all gases?
A: It's exact for ideal gases. Real gases show slight deviations due to intermolecular forces and molecular size.

Q4: What is molar volume at room temperature?
A: At 25°C and 1 atm, molar volume is approximately 24.5 L/mol for ideal gases.

Q5: How is molar volume used in stoichiometry?
A: It allows conversion between volume of gases and moles in chemical equations, essential for reaction yield calculations.