Graham's Law Formula:
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Definition: This calculator determines the molar mass of an unknown gas using Graham's Law of Effusion by comparing its effusion rate with a known gas.
Purpose: It helps chemists and students calculate the molar mass of gases based on their relative rates of effusion.
The calculator uses Graham's Law formula:
Where:
Explanation: The rate of effusion of a gas is inversely proportional to the square root of its molar mass.
Details: This calculation is essential for identifying unknown gases, understanding gas behavior, and solving problems in physical chemistry.
Tips: Enter the molar mass of the known gas, and the effusion rates of both gases. All values must be > 0.
Q1: What is effusion?
A: Effusion is the process where gas molecules escape through a tiny hole into a vacuum.
Q2: Why does Graham's Law work?
A: Lighter gas molecules move faster than heavier ones at the same temperature, so they effuse more quickly.
Q3: What are typical units for molar mass?
A: While kg/mol is the SI unit, g/mol is more commonly used in chemistry (1 kg/mol = 1000 g/mol).
Q4: How do I measure effusion rates?
A: Effusion rates can be measured by timing how long it takes for a certain volume of gas to escape.
Q5: Can I use this for diffusion calculations?
A: Yes, Graham's Law applies to both effusion and diffusion rates.