Question

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

Answer 1

Atomic mass = Mass of 1 atom = 39.1 amu
Mass of 6.02 × 1023 atoms = 39.1 x 6.02 x 10^23 amu
Btw, 6.02 x 10^23 atoms = 1 mol

Number of mol = Mass (in gram) / Atomic Mass
1 = Mass (in gram) / 39.1
Mass (ingram) = ?

Answer 2

the answer is b