1. What is Molar Volume of Hydrogen Gas at STP?

The molar volume of hydrogen gas at STP (Standard Temperature and Pressure) is the volume occupied by one mole of hydrogen gas under standard conditions of 0°C temperature and 1 atm pressure. The theoretical value 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)
• \( V \) — Measured volume of gas at STP (L)
• \( n \) — Number of moles of hydrogen gas

Calculation Steps:

1. Calculate moles: \( n = \frac{\text{mass}}{\text{molar mass}} = \frac{\text{mass}}{2.016} \)
2. Calculate molar volume: \( V_m = \frac{\text{volume}}{n} \)
3. Compare with theoretical value: 22.4 L/mol

3. Importance of Molar Volume Calculation

Details: Understanding molar volume is fundamental in gas stoichiometry, ideal gas law applications, and laboratory experiments involving gas measurements. It helps verify the ideal gas law and understand gas behavior under standard conditions.

4. Using the Calculator

Tips: Enter the mass of hydrogen gas in grams and the measured volume at STP in liters. Ensure measurements are taken at exactly 0°C and 1 atm pressure for accurate results.

5. Frequently Asked Questions (FAQ)

Q1: Why is the molar volume 22.4 L/mol for all ideal gases at STP?
A: According to Avogadro's law, equal volumes of all gases at the same temperature and pressure contain the same number of molecules, hence the same molar volume.

Q2: What is STP?
A: STP stands for Standard Temperature and Pressure, defined as 0°C (273.15 K) temperature and 1 atm (101.325 kPa) pressure.

Q3: Why might experimental values differ from 22.4 L/mol?
A: Experimental errors, non-ideal gas behavior, temperature and pressure variations, and measurement inaccuracies can cause deviations from the theoretical value.

Q4: How does molar volume change with temperature and pressure?
A: Molar volume increases with increasing temperature and decreases with increasing pressure, following the ideal gas law: \( V_m = \frac{RT}{P} \).

Q5: What is the molar mass of hydrogen gas?
A: The molar mass of hydrogen gas (H₂) is 2.016 g/mol, as hydrogen atoms have atomic mass of approximately 1.008 g/mol each.