We have chosen amu to
be 1/12 of carbon atom since carbon is a very common element and also amu of
the other elements are almost whole numbers. Lightest atom a mass of
approximately.
So, Avogadro’s
constant will change if we change the reference to 1/24th mass of
carbon atom(it will not be a whole number).
Thanks & Regards,
Vasantha Sivaraj,
askIITians faculty.