The atomic mass of potassium is 39.1. what is the mass of 6.02 × 1023 atoms of potassium? . a.. 39.1 mg. . . b.. 39.1 g. . . c.. 39.1 kg. . . d.. 6.02 × 39.1 mg. . . e.. 6.02 × 39.1 g

Atomic mass of Potassium = Mass of 1 atom of Potassium = 39.1 amu
Then
Mass of 6.02 x 1023 atoms of potassium = 39.1 x 6.02 x 1023 amu
                                                                  = 
We already know that
1 mole = 6.02 x 1023 atoms
Also
Number of mole = mass in grams/ atomic mass
Then
Mass in gram = Number of mole x atomic mass
                       = (39.1 x 6.02 x 1023)/(6.02 x 1023)
                       = 39.1 g
The correct option among all the options that are given in the question is the third option or option "B".