Chemistry
Grade-9
Easy
Question
What is meant by 1 u or 1 amu?
- 1/12th mass of carbon-12 atom
- Mass of H atom
- Mass of C atom
- Mass of O atom
Hint:
One atomic mass unit (1u) is a mass unit equal to exactly one-twelfth (1/12th) the mass of one atom of carbon-12 isotope.
The correct answer is: 1/12th mass of carbon-12 atom
One atomic mass unit (1u) is a mass unit equal to exactly one-twelfth (1/12th) the mass of one atom of carbon-12 isotope.
The symbol for the unit is u (unified atomic mass unit) or Da (Dalton), although amu may still be used.
1 amu = 1.67377 x 10 -27 kilogram or 1.67377 x 10 -24 gram. 1amu = 1.662 x 10-24g.
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