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if the molecular mass of a gas increases by a factor of 4 at constant temperature, its rms speed is decrease by a factor of 2.
- The mass of a given molecule is its molecular mass (m), which is expressed in Daltons. Because they contain various isotopes of an element, multiple molecules of the same substance can have distinct molecular weights. According to IUPAC, the related quantity relative molecular mass is a unitless comparison between the mass of a molecule and the unified atomic mass unit (also called the Dalton).
- . The molar mass, which is stated in g/mol, is defined as the mass of a specific material divided by the amount of a substance.
As a result, the molecular mass is the mass of a single particle or molecule, while the molar mass is the average of numerous particles or molecules. When discussing macroscopic (weigh-able) amounts of a substance, the molar mass is typically the most relevant number.
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