Combined Gas Law

Note that temperatures must be in Kelvin

Table

Gas Law Variables Constant Equation
Boyle's Law
Charle's Law
Gay Lussac's Law

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Avogadro's law

Avogadro's Law (Avogadro-Ampère Hypothesis)

Law

Equal volumes of all gasses at the same temperature and pressure, have the same number of molecules.

Combined Gas Law

Law

Example

What is the volume of of hydrogen gas if the pressure on it increases from to ?

solution

Example

A cylinder of chlorine gas is designed to withstand of pressure. The pressure gauge reads at . A fire causes the temperature in the storage room to increase to . What will the pressure gauge read at this temperature?

solution

Example

Determine the final volume of of a gas whose temperature changes from to if the pressure remains constant.

solution

Example

A weather balloon contains of helium gas at and . What is the volume at STP?

solution
Use combined gas law.

Example

A welder requires of oxygen gas at of pressure and at a temperature of . To what pressure must a tank be filled at ?

solution