You would convert from grams to moles by using the of the substance.
a. ionization energy
c. atomic number
b. molar mass
d. avogadro’s number

You would convert from grams to moles by using the molar mass of the substance. The answer is letter B. for example, the molar mass Carbon dioxide is 44.01 g/mol. It means that for 1 mole of carbon dioxide, it contains 44.01 grams of Carbon dioxide.

answerdmitry mendeleyev made a workable classification of the elements