Final answer:
To convert from grams to the number of molecules, calculate the number of moles using the mass and molar mass, then multiply the moles by Avogadro's number.
Step-by-step explanation:
To convert from grams to the number of molecules, you need to follow a two-step process involving Avogadro's number and molar mass. First, you convert the mass in grams to moles using the formula n = m/M', where n is the number of moles, m is the mass in grams, and M' is the molar mass in grams per mol (g/mol).
After finding the number of moles, you multiply this number by Avogadro's number (6.022 x 1023 particles/mol) to convert moles to the number of particles, or molecules, of the substance.