Chemistry
Grade-8
Easy
Question
Atomic mass is defined as:
- Mass of one atom compared with the mass of one atom of C – 12
- Average mass of atom compared to 1/12 mass of one C-12 atom
- Mass of one atom compared with mass of molecule
- Average mass of atom compared to mass of one hydrogen atom
Hint:
Used in AMU because it is the only atom with the same integer mass as the AMU scale
The correct answer is: Average mass of atom compared to 1/12 mass of one C-12 atom
- Atomic mass is the amount of matter contained in the atoms of an element. It is expressed as a multiple of 12 times the mass of the carbon-12 atom, 1.992646547 × 10−23 grams, which has an assigned atomic mass of 12 units. On this scale, one atomic mass unit (AMU) is equivalent to 1.660539040 × 10−24 grams.
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