stephhBisoRegirl
contestada

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

Respuesta :

taskmasters
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".
mahima6824soni

The atomic mass of potassium is 39.1, the mass of 6.02 × 1023 atoms of potassium is 39.1 g.

What is atomic mass?

The atomic mass of any molecule is the average mass of the atoms of the molecules.

Mass of 6.02 x 10²³ atoms of potassium = 39.1 x 6.02 x 10²³ amu    

 = 2.35382 × 10²⁵

Calculating the number of moles

Mass in gram = Number of mole x atomic mass

(39.1 x 6.02 x 1023) / (6.02 x 1023) = 39.1 g

                     

Thus, the correct option is B, 39.1 g

Learn more about atomic mass

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