Reduced Molar Volume of Real Gas given Wohl Parameter c and Actual and Critical Parameters Calculator

Formula:

\[ V'_r = \frac{V'_m}{\left(\frac{c}{4 \times P_{c} \times (T'_c)^2}\right)^{1/3}} \]

Molar Volume of Real Gas (V'm):

m³

Wohl Parameter c:

Critical Pressure (P_c):

Critical Temperature (T'_c):

Reduced Molar Volume (V'_r):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is Reduced Molar Volume for P-R Method?

Definition: Reduced Molar Volume for P-R Method of a fluid is computed from the ideal gas law at the substance's critical pressure and temperature per mole.

Purpose: It helps in understanding and predicting the behavior of real gases under various conditions using the Peng-Robinson equation of state.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ V'_r = \frac{V'_m}{\left(\frac{c}{4 \times P_{c} \times (T'_c)^2}\right)^{1/3}} \]

Where:

\( V'_r \) — Reduced Molar Volume for P-R Method
\( V'_m \) — Molar Volume of Real Gas (m³)
\( c \) — Wohl parameter c (empirical parameter)
\( P_{c} \) — Critical Pressure (Pa)
\( T'_c \) — Critical Temperature (K)

Explanation: The formula relates the actual molar volume to reduced properties using the Wohl parameter and critical properties of the substance.

3. Importance of Reduced Molar Volume Calculation

Details: This calculation is essential in thermodynamics for predicting gas behavior, designing chemical processes, and modeling phase equilibria.

4. Using the Calculator

Tips: Enter the molar volume of real gas, Wohl parameter c, critical pressure, and critical temperature. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the Wohl parameter c?
A: Wohl parameter c is an empirical parameter characteristic to equation obtained from Wohl model of real gas.

Q2: How do I find critical properties of a substance?
A: Critical properties are typically found in chemical engineering reference books or thermodynamic databases for each substance.

Q3: What units should I use for inputs?
A: Use m³ for molar volume, Pascals for pressure, and Kelvin for temperature. The Wohl parameter is dimensionless.

Q4: Can this be used for all gases?
A: The calculation is most accurate for non-polar or slightly polar gases following Peng-Robinson behavior.

Q5: What does the reduced volume tell us?
A: It shows how the actual volume compares to the critical volume, helping predict gas behavior under different conditions.