define the atomic mass unit
Answers
Answer:
a unit of mass used to express atomic and molecular weights equal to one twelfth of the mass of an atom carbon
Answer:
The dalton or unified atomic mass unit (symbols: Da or u) is a unit of mass widely used in physics and chemistry. It is defined as 1/12 of the mass of an unbound neutral atom of carbon-12 in its nuclear and electronic ground state and at rest.[1][2] The atomic mass constant, denoted mu, is defined identically, giving.
mu = m(12C)/12 = 1 Da.
Explanation:
This unit is commonly used in physics and chemistry to express the mass of atomic-scale objects, such as atoms, molecules, and elementary particles, both for discrete instances and multiple types of ensemble averages. For example, an atom of helium-4 has a mass of 4.0026 Da. This is an intrinsic property of the isotope and all helium-4 have the same mass. Acetylsalicylic acid (aspirin), C
9H
8O
4, has an average mass of approximately 180.157 Da. However, there are no acetylsalicylic acid molecules with this mass. The two most common masses of individual acetylsalicylic acid molecules are 180.04228 Da and 181.04565 Da.
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The molecular masses of proteins, nucleic acids, and other large polymers are often expressed with the units kilodaltons (kDa), megadaltons (MDa), etc.[4] Titin, one of the largest known proteins, has a molecular mass of between 3 and 3.7 megadaltons.[5] The DNA of chromosome 1 in the human genome has about 249 million base pairs, each with an average mass of about 650 Da, or 156 GDa total.[