Wohl Parameter (c) of Real Gas using Wohl Equation Calculator

Wohl Parameter c Formula:

\[ c = \left(P - \frac{RT}{V_m - b} + \frac{a}{T V_m (V_m - b)}\right) \times (T^2 V_m^3) \]

Pressure of Gas (P):

Temperature (T):

Molar Volume (V_m):

m³/mol

Wohl Parameter a:

Wohl Parameter b:

m³/mol

Wohl Parameter c:

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1. What is Wohl Parameter c?

Definition: Wohl parameter c is an empirical parameter characteristic to equation obtained from Wohl model of real gas.

Purpose: It's used in the Wohl equation of state to describe the behavior of real gases, accounting for intermolecular forces and molecular volume.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ c = \left(P - \frac{RT}{V_m - b} + \frac{a}{T V_m (V_m - b)}\right) \times (T^2 V_m^3) \]

Where:

\( c \) — Wohl parameter c
\( P \) — Pressure of gas (Pascal)
\( T \) — Temperature of real gas (Kelvin)
\( V_m \) — Molar volume of real gas (m³/mol)
\( a \) — Wohl parameter a
\( b \) — Wohl parameter b (m³/mol)
\( R \) — Universal gas constant (8.314 J/mol·K)

3. Importance of Wohl Parameter c

Details: The Wohl equation provides a more accurate description of real gas behavior compared to the ideal gas law, especially at high pressures and low temperatures.

4. Using the Calculator

Tips: Enter all required parameters. Ensure molar volume is greater than parameter b. Temperature must be in Kelvin and pressure in Pascals.

5. Frequently Asked Questions (FAQ)

Q1: What are typical values for Wohl parameters?
A: Parameters a, b, and c are substance-specific and must be determined experimentally for each gas.

Q2: When is the Wohl equation most useful?
A: For polar gases and conditions where the ideal gas law fails (high pressure, low temperature).

Q3: What's the relationship between V_m and b?
A: V_m must always be greater than b, as b represents the excluded volume per mole.

Q4: How does temperature affect the calculation?
A: Higher temperatures generally reduce the impact of molecular interactions accounted for by parameter c.

Q5: Can this be used for gas mixtures?
A: Yes, but mixing rules must be applied to determine effective parameters for the mixture.