Antoine Calculator N-Hexane

The Antoine Calculator for n-Hexane helps you determine vapor pressure and boiling point of n-hexane at different temperatures using the Antoine equation. This tool is essential for chemical engineers, chemists, and students working with hydrocarbons.

What is the Antoine Equation?

The Antoine equation is a mathematical relationship between the vapor pressure of a liquid and its temperature. It's commonly used to estimate vapor pressure at different temperatures for pure substances.

Antoine Equation Formula

log₁₀(P) = A - (B / (T + C))

Where:

P = vapor pressure (mmHg or kPa)
T = temperature (°C or K)
A, B, C = Antoine coefficients specific to each substance

The equation is typically expressed in logarithmic form, making it easier to handle the exponential relationship between pressure and temperature.

How to Use This Calculator

Enter the temperature in degrees Celsius
Select the desired pressure unit (mmHg or kPa)
Click "Calculate" to get the vapor pressure
Review the result and chart visualization
Use the "Reset" button to clear inputs

Note

This calculator uses Antoine coefficients for n-hexane. Results are estimates and may vary slightly from experimental data.

n-Hexane Properties

n-Hexane (C₆H₁₄) is a straight-chain alkane with the following properties:

Molecular weight: 86.18 g/mol
Boiling point: 68.73°C at 1 atm
Melting point: -95.72°C
Density: 0.6549 g/cm³ at 20°C

n-Hexane is widely used as a solvent in laboratories and industrial processes due to its low toxicity and good solvency properties.

Example Calculation

Let's calculate the vapor pressure of n-hexane at 25°C using the Antoine equation.

Example Calculation

Given:

Temperature (T) = 25°C
Antoine coefficients for n-hexane: A = 6.88257, B = 1247.22, C = -48.04

Calculation:

log₁₀(P) = 6.88257 - (1247.22 / (25 - 48.04))

log₁₀(P) = 6.88257 - (1247.22 / -23.04)

log₁₀(P) = 6.88257 + 54.13

log₁₀(P) = 61.01257

P = 10^61.01257 ≈ 1.02 × 10⁶¹ mmHg

This example shows how the vapor pressure of n-hexane increases dramatically with temperature, which is typical for volatile liquids.

Frequently Asked Questions

What are the Antoine coefficients for n-hexane?

The Antoine coefficients for n-hexane are typically A = 6.88257, B = 1247.22, and C = -48.04 when using temperature in °C and pressure in mmHg.

How accurate is the Antoine equation for n-hexane?

The Antoine equation provides reasonable estimates for vapor pressure over a wide temperature range, but actual measurements may vary by up to 10% depending on conditions.

Can I use this calculator for other hydrocarbons?

This calculator is specifically designed for n-hexane. For other hydrocarbons, you would need the appropriate Antoine coefficients for that substance.

What units should I use for temperature?

The calculator uses degrees Celsius (°C) for temperature input. Make sure to convert other temperature units to Celsius before using this calculator.