Define 'atomic mass unit '. How is it linked with relative atomic mass?

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Solution

The atomic mass unit is 1/12th the mass of one atom of carbon atom having an atomic mass of 12u.
Relative atomic mass of the atom of an element is the average mass of the atom as compared to 1/12th the mass of carbon atom having atomic mass is 12u.
The relative atomic mass of an element = $\frac{a v e r a g e m a s s o f 1 a t o m o f t h e e l e m e n t}{\frac{1}{12 t h} t h e m a s s o f 1 a t o m o f c a r b o n - 12}$

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