Final answer:
The correct conversion factor to convert between moles and grams is the molar mass, expressed as grams per mole, which is found using the atomic mass from the periodic table or summing these for a compound.
Step-by-step explanation:
The appropriate conversion factor to use when solving a problem that involves converting between moles and grams is the molar mass of the substance in question. This molar mass acts as a bridge between the mass in grams and the amount in moles.
The correct conversion factor to use in the context provided would be the molar mass expressed as grams per mole (g/mol) because it relates the mass of the substance in grams to the number of moles. Typically, you would locate the atomic mass of the substance on the periodic table and use it as the molar mass (for pure elements), or calculate the molar mass by summing the atomic masses of the elements in a compound. If you are given the mass in grams and asked to convert to moles, you would use the reciprocal of the molar mass as the conversion factor.