what is molecules and mass unit of SI
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Answer:
The molecular mass (m) is the mass of a given molecule: it is measured in daltons . Different molecules of the same compound may have different molecular masses because they contain different isotopes of an element. The related quantity relative molecular mass, as defined by IUPAC, is the ratio of the mass of a molecule to the unified atomic mass unit (also known as the dalton) and is unitless. The molecular mass and relative molecular mass are distinct from but related to the molar mass. The molar mass is defined as the mass of a given substance divided by the amount of a substance and is expressed in g/mol. The molar mass is usually the more appropriate figure when dealing with macroscopic (weigh-able) quantities of a substance
Explanation:
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Answer:
a group of atoms bonded together representing the smallest fundamental unit of a chemical compound that can take part in chemical reaction
the SI unit of mass is kilogram