Answer:
6.55 x 10^22 atoms K
Explanation:
Convert from grams to moles (using K molar mass)
K molar mass = 39.098 g/mol
4.25 g K x 1 mol K / 39.098 g K
[grams cancel out]
= 0.1087 mols K
Convert from moles to atoms (using Avogadro's number)
Avogadro's number = 6.0221 x 10^23
0.1087 mols K x 6.0221 x 10^23 atoms K / 1 mols K
[mols cancel out]
= 6.545987 x 10^22
[with proper significant digits.....]
= 6.55 x 10^22 atoms K
