Question

# The modern atomic mass unit is based on the mass of :

A
C-12 isotope
B
hydrogen
C
oxygen
D
nitrogen

Solution

## The correct option is A C-12 isotopeOne a.m.u. or one 'u' is equal to $$1.66053892 10^{-24}\ g$$  or $$1.66053892 10^{-27}\ kg$$. It is equal to $$\dfrac{1}{12}$$ of the mass of an atom of carbon-12.It is used as a standard. The masses of all other atoms are determined relative to the mass of an atom of carbon-12.Chemistry

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