Final answer:
The conversion formula for converting between particles and moles is based on Avogadro's number. To convert from particles to moles, divide the number of particles by Avogadro's number.
Step-by-step explanation:
The conversion formula for converting between particles and moles when dealing with a substance is based on Avogadro's number. Avogadro's number is defined as 6.022 × 1023 particles per mole.
To convert from particles to moles, divide the number of particles by Avogadro's number. For example, if you have 2.408 × 1023 particles of a substance, you would divide it by Avogadro's number to get the number of moles:
2.408 × 1023 particles / (6.022 × 1023 particles/mol) = 0.4 mol