Suppose the atomic mass unit had been defined as 1/10 th of the average mass of an atom of phosphorus. What would the atomic mass of Carbon be on this scale. What would Avogadro's number be?

Answer 1

It is now 1/12 of atom C12 = 1/12 x 12 = 1.0 and 1.0/6.02E23 = 1.66E-24 grams for 1 amu.

If 1/10 P31 then 1/10 x 31 = 31/10 and
31/10 x 1/6.02E23 = 5.15E-24 g = 1 amu.
Check my thinking.