Which mathematical relationship should you use to convert moles of a substance into grams?

No. Of moles = mass / molarmass.

Explanation:

From mass - mole relationship,

No. Of moles = mass / molarmass

Usually, molarmass of a substance have a unit of g/mol.

And since molarmass have units in g/mol, there's no need to convert it into grams. Just convert the value of the mass into grams if it's not in grams by the relation

1kg = 1000g

for points guys

it is b that is the answer.