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Chemistry Constants (Quick Reference)

One-tap copy of the constants you use every day. Toggle LaTeX copy and units where helpful.

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Fundamentals

Avogadro’s number (N_A)

Elementary charge (e)

Atomic mass unit (1 u)

Speed of light (c)

Planck’s constant (h)

Boltzmann constant (k_B)

Chemistry favorites

Gas constant (R = N_A·k_B)

Faraday’s constant (F = N_A·e)

More gas constants (common units)

R in L·atm·mol⁻¹·K⁻¹

R in L·Torr·mol⁻¹·K⁻¹ (mmHg)

R in L·bar·mol⁻¹·K⁻¹

Notes

Exact by SI definition: N_A, e, c, h, and k_B. Identities like F = N_A·e and R = N_A·k_B follow directly; we display numeric values to standard precision.
The atomic mass unit (1 u) in g or kg follows CODATA recommended values.
Atmosphere conversions are exact: 1 atm = 101,325 Pa = 101.325 kPa.

1. Intro to General Chemistry

Metric Prefixes

1. Intro to General Chemistry

Scientific Notation

1. Intro to General Chemistry

Conversion Factors

1. Intro to General Chemistry

Dimensional Analysis

1. Intro to General Chemistry

Significant Figures

1. Intro to General Chemistry

2. Atoms & Elements

2. Atoms & Elements

Law of Conservation of Mass

2. Atoms & Elements

The Ideal Gas Law

The Ideal Gas Law Derivations

The Ideal Gas Law Applications

First Law of Thermodynamics -

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Enthalpy of Formation

8. Thermochemistry

8. Thermochemistry

9. Quantum Mechanics

Photoelectric Effect

9. Quantum Mechanics

9. Quantum Mechanics

19. Chemical Thermodynamics

Gibbs Free Energy

19. Chemical Thermodynamics

Gibbs Free Energy & Equilibrium

19. Chemical Thermodynamics

Cell Potential and Gibbs Free Energy

20. Electrochemistry

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1. Intro to General Chemistry - Part 2 of 3

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1. Intro to General Chemistry - Part 3 of 3

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2. Atoms & Elements - Part 2 of 4

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2. Atoms & Elements - Part 3 of 4

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2. Atoms & Elements - Part 4 of 4

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7. Gases - Part 2 of 4

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7. Gases - Part 3 of 4

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8. Thermochemistry - Part 1 of 3

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8. Thermochemistry - Part 2 of 3

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8. Thermochemistry - Part 3 of 3

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9. Quantum Mechanics - Part 1 of 3

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9. Quantum Mechanics - Part 2 of 3

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9. Quantum Mechanics - Part 3 of 3

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19. Chemical Thermodynamics - Part 1 of 2

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19. Chemical Thermodynamics - Part 2 of 2

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20. Electrochemistry - Part 1 of 3

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20. Electrochemistry - Part 2 of 3

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20. Electrochemistry - Part 3 of 3

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