Key Concepts: Ideal Gas Law

Core Definitions

• Ideal Gas Law: PV = nRT; relates pressure, volume, moles, and temperature.
• R (Gas Constant): 0.0821 L·atm/(mol·K) or 8.314 J/(mol·K).
• n: The number of moles of gas.
• When to Use: When you need to find P, V, n, or T and have the other three values.
• Ideal vs. Real: Ideal gases perfectly follow PV = nRT; real gases deviate at high P and low T.
• Units Must Match R: If R = 0.0821, use atm, L, mol, and K.