Frequently Asked Questions
What is the ideal gas law?
PV = nRT. Pressure × Volume = moles × gas constant × Temperature. R = 8.314 J/(mol·K) when SI units are used. Temperature MUST be in Kelvin.
Why must temperature be in Kelvin?
Because the law assumes pressure and volume scale linearly with absolute temperature. At 0 K an ideal gas would have zero pressure or volume, which only works on the Kelvin scale.
When does the ideal gas law break down?
At very high pressures and very low temperatures, gas molecules' size and intermolecular attractions matter. Real gases need corrections like the van der Waals equation.
What is one mole of gas at STP?
At 0°C (273.15 K) and 1 atm, one mole of ideal gas occupies 22.4 L. At 25°C and 1 atm, it occupies 24.47 L.
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