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Convert atomic mass units (u) to grams, kilograms, and electron masses instantly
1 atomic mass unit (u) = 1.66054 x 10-24 grams
1 atomic mass unit (u) = 1.66054 x 10-27 kilograms
1 atomic mass unit (u) = 1822.888 electron masses
| AMU (u) | Grams (g) | Electron Masses |
|---|---|---|
| 1 | 1.66054e-24 | 1822.888 |
| 10 | 1.66054e-23 | 18228.88 |
| 100 | 1.66054e-22 | 182288.8 |
| 1000 | 1.66054e-21 | 1822888 |
| 12 | 1.99265e-23 | 21874.66 |
| 16 | 2.65686e-23 | 29166.21 |
| 23 | 3.81924e-23 | 41926.42 |
| 56 | 9.29902e-23 | 102081.7 |
| 238 | 3.95209e-22 | 433847.3 |
Note: Common AMU values include Carbon-12 (12 u), Oxygen-16 (16 u), Sodium-23 (23 u), Iron-56 (56 u), and Uranium-238 (238 u).
The atomic mass unit (symbol: u or amu), also called the dalton (Da), is a standard unit of mass used to express atomic and molecular masses. One atomic mass unit is defined as exactly 1/12 of the mass of a carbon-12 atom in its ground state, which equals approximately 1.66054 x 10-24 grams. This incredibly small unit is essential in chemistry and physics for expressing the masses of atoms, molecules, and subatomic particles. The AMU provides a convenient scale where hydrogen atoms have a mass close to 1 u, making calculations in chemistry and nuclear physics more manageable than using grams or kilograms.
One atomic mass unit equals exactly 1.66053906660 x 10-24 grams. It is defined as 1/12 the mass of a carbon-12 atom.
Yes, the atomic mass unit (amu or u) and the dalton (Da) are exactly the same. The dalton is the preferred name in modern scientific literature.
Carbon-12 was chosen because it is a stable, abundant isotope, and using 12 u for carbon makes hydrogen close to 1 u, simplifying calculations in chemistry.
A proton has a mass of approximately 1.007276 atomic mass units. A neutron has approximately 1.008665 u.
An electron has a mass of approximately 0.000548597 atomic mass units, or about 1/1823 of a proton's mass.
Mass number is the total count of protons and neutrons (always a whole number), while atomic mass is the actual measured mass in AMU (usually not a whole number due to binding energy).