Gases

STP

• Standard temperature: 0 C=273K
• Standard pressure: 1atm =760mmHg =760torr = 101.3kPa

Three gas Laws

• Boyles Law: P1(V1)=P2(V2)
• Charles law: V1/Tl=V2/T2
• Gay-Lussac's Law: P1/T1=P2/T2

combined Gas law

• P1xV1/T1=P2xV2/T2
• This is the three laws all combined into one law

Ideal gas law

• Formula: PV=nRT
• P: pressure
• V: volume
• n: number of moles
• R: the constant
• T: temperature

When to Use one of the laws

• Combined gas law: when there is 2 pressures, 2 temperatures, and/or 2 volumes
• Ideal gas law: when the problem says something about moles or grams.