Convert 3.5 x 10^23 K atoms to moles

0.58 moles

2.1 x 10^47 moles

5.8 x 10^45 moles

2.5 x 10^23 moles

We can determine the number of moles using Avogadro's constant, which is defined as 6.02x10^23 atoms/mole. Using stoichiometry so the units (atoms) cancel: 3.5 x 10^23 atoms x (1 mole/6.02x10^23 atoms) = 0.58 moles of K atoms