gram-atomic weight
Definition
- Noun:
- Gram-atomic weight: The mass of one mole of atoms of a pure chemical element, expressed in grams. It is numerically equal to the element's atomic weight (average atomic mass) but with the unit grams (g) instead of atomic mass units (u). This quantity contains exactly Avogadro's number (approximately 6.022 x 10²³) of atoms of that element.
Usage Examples
- Noun:
- The gram-atomic weight of carbon-12 is exactly 12 grams.
- To perform the calculation, you first need to find the gram-atomic weight of oxygen from the periodic table.
- One gram-atomic weight of any element contains the same number of atoms.
Advanced Usage
- The term gram-atomic weight is largely synonymous with the modern term when referring to a pure element. Molar mass is the more commonly used term in contemporary chemistry.
- It is a specific application of the concept of the mole for atomic elements.
Variants and Related Words
- Atomic weight (n): The average mass of atoms of an element, measured in atomic mass units (u). It is the dimensionless number that gives the gram-atomic weight its numerical value.
- Molar mass (n): The mass of one mole of a given substance (element or compound). For an element, its molar mass in g/mol is numerically identical to its gram-atomic weight.
- Mole (n): The base SI unit for amount of substance, defined as containing exactly 6.02214076×10²³ elementary entities (atoms, molecules, ions, etc.).
Synonyms
- Molar mass (of an element): The preferred modern term.
- Atomic weight (in grams): A descriptive synonym.
Related Phrases
- Gram-molecular weight (n): The analogous concept for a molecule or compound; the mass of one mole of a molecular substance in grams.
Noun
-
the quantity of an element whose weight in grams is numerically equal to the atomic weight of the element
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