Question

If atomic weight of copper is 63 then its molecular weight will be

Answer 1

then it's molecular wt. will be 126 .
since molecular wt.= (no.of protons +no.of neutrons)×2
note that atomic wt of Cu is 63.54 therefore it's molecular wt will be 127.08

Answer 2

The atomic weight of copper is 63 u.
Molecular weight is nothing but atomic weight expressed in grams.
So molecular weight of copper is 63 grams.