Question

How many atoms of potassium are in 4.25 g of potassium
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Answer 1

6.55 x 10^22 atoms K

Step-by-step 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