1. What is Critical Molar Volume of Wohl's Real Gas?

Definition: The critical molar volume is the volume occupied by one mole of gas at critical temperature and pressure according to Wohl's real gas model.

Purpose: This calculator determines the critical molar volume using actual and reduced parameters of temperature and pressure.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( V'_c \) — Critical molar volume (m³/mol)
• \( [R] \) — Universal gas constant (8.314 J/mol·K)
• \( T_{rg} \) — Temperature of real gas (K)
• \( T_r \) — Reduced temperature (dimensionless)
• \( P_{rg} \) — Pressure of gas (Pa)
• \( P_r \) — Reduced pressure (dimensionless)

Explanation: The formula relates the actual and reduced parameters to calculate the critical volume using Wohl's model.

3. Importance of Critical Molar Volume

Details: Critical properties are essential for understanding gas behavior near critical points and for designing chemical processes.

4. Using the Calculator

Tips: Enter the actual temperature (K), reduced temperature, actual pressure (Pa), and reduced pressure. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is reduced temperature and pressure?
A: Reduced parameters are the ratio of actual values to critical values (T_r = T/T_c, P_r = P/P_c).

Q2: Why use Wohl's model?
A: Wohl's equation provides a more accurate description of real gas behavior than ideal gas law.

Q3: What are typical units for critical molar volume?
A: The standard unit is cubic meters per mole (m³/mol), often expressed in liters for practical use.

Q4: How accurate is this calculation?
A: Accuracy depends on the precision of input parameters and the applicability of Wohl's model to your specific gas.

Q5: Can I use this for any gas?
A: Yes, but results are most accurate for gases where Wohl's model is appropriate (non-polar or slightly polar gases).