Combined Gas Law Calculator
Calculate the final volume (V2) or other parameters in gas transformations using the combined gas law.
Calculation Parameters
Specify your stoichiometry inputs.
Calculated Result
Final Volume (V2)
Expert Tip
Ensure units are correctly formatted (e.g. Kelvin for gas temperatures and liters for volumes) to get chemically accurate outputs.
How this Calculator Works
This calculator allows you to solve Combined Gas Law problems dynamically. Adjust the input parameters using the sliders or selection menu below:
- Initial Pressure P1 (atm) (Range: 0.1 to 10.0, Default: 1.0)
- Initial Volume V1 (L) (Range: 1 to 100, Default: 10)
- Initial Temp T1 (°C) (Range: -100 to 300, Default: 20)
- Final Pressure P2 (atm) (Range: 0.1 to 10.0, Default: 2.0)
- Final Temp T2 (°C) (Range: -100 to 300, Default: 50)
The results are computed instantly and updated in the results panel on the right.
Formula & Methodology
T (Kelvin) = Temp (°C) + 273.15
Where:
- Initial Pressure P1: Parameter value.
- Initial Volume V1: Parameter value.
- Initial Temp T1: Parameter value.
- Final Pressure P2: Parameter value.
- Final Temp T2: Parameter value.
Step-by-Step Calculation Example
To calculate Combined Gas Law manually, follow these steps:
- Identify the input parameters. For example:
- Initial Pressure P1 (atm) = 1.0
- Initial Volume V1 (L) = 10
- Initial Temp T1 (°C) = 20
- Final Pressure P2 (atm) = 2.0
- Final Temp T2 (°C) = 50
- Apply the formula:
(P1 * V1) / T1 = (P2 * V2) / T2
T (Kelvin) = Temp (°C) + 273.15 - Verify the calculated value which is updated instantly in the results panel on the right.
Frequently Asked Questions
What is the combined gas law? ▼
(P1 × V1) / T1 = (P2 × V2) / T2, combining Boyle's, Charles's, and Gay-Lussac's gas laws.
Which quantity is held constant in the combined gas law? ▼
The total amount (number of moles, n) of gas is held constant.
Why must temperature be in Kelvin? ▼
Gas laws rely on absolute zero thermal motion scale; using Celsius would produce mathematical errors and division by zero.