How to identify the molecular weight in dalton.?

Answer 1

One Dalton is the same as one atomic mass unit (AMU). Add up the atomic weights of all the components in the molecule, and you have the atomic mass, which may be expressed in Daltons.

"The symbol amu for atomic mass unit can sometimes still be found, particularly in older works. Atomic masses are often written without any unit and then the atomic mass unit is implied. In biochemistry and molecular biology literature (particularly in reference to proteins), the term "dalton" is used, with the symbol Da. Because proteins are large molecules, they are typically referred to in kilodaltons, or "kDa", with one kilodalton being equal to 1000 daltons. The unified atomic mass unit is not an SI unit of mass, although it is (only by that name, and only with the symbol u) accepted for use with SI."

That's from reference 1.

Answer 2

you multiply the grams by avogadro's number (6.02 x 10^23)