Gas Laws Formulas

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22 Terms

1
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Boyle’s Law

P1V1 = P2V2

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Charles’s Law

V1/T1 = V2/T2

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Gay-Lussac’s Law

P1/T1 = P2/T2

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The Combined Gas Law

P1V1/T1 = P2V2/T2

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Daltons Law

Ptotal = P1 + P2 + P3 + …

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Mole fraction

PA = XA*Ptotal where XA= molA/moltotal

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Ideal Gas Law

PV = nRT

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Ideal Gas Law: when P is atm, R is

0.08206

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Ideal Gas Law: when P is kPa, R is

8.314

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Ideal Gas Law: when P is mmHg, R is

62.4

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(Use when asked to solve problems involving density of a gas or to identify it based on calculation of its molar mass)

PV = nRT where n = mass/MM

PV = (mass/MM) RT

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(Use when asked to solve problems involving density of a gas or to identify it based on calculation of its molar mass)

MM = (mass*RT)/PV where D = mass / V

MM = (DRT) / P

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STP

Standard Temperature and Pressure

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Standard Pressure

1 atm = 760 torr = 760 mmHg = 101.3 kPa

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Standard Temperature

0oC = 273 K

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Boyle’s Law : Inverse or Direct

Inverse

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Charles’s Law: Inverse or Direct

Direct

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When to use Boyle’s Law?

For a given mass at constant temperature

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When to use Charles’s Law

Pressure is constant

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When to use Gay-Lussac’s Law

When volume is constant

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Gay-Lussac’s Law: Inverse or Direct

Direct

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When to use the Combined Gas Law?

Amount of gas is constant