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What happens when you divide grams by g/mol?

a) Molar mass
b) Density
c) Molecular weight
d) Atomic mass

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Final answer:

Dividing grams by g/mol (molar mass) calculates the number of moles of a substance, using the relationship where moles equal mass in grams divided by molar mass.

Step-by-step explanation:

When you divide grams by g/mol (grams per mole or molar mass), you are calculating the number of moles of substance. This is based on the formula:

moles (n) = mass in grams (m) ÷ molar mass (M)

The molar mass is a measure of the mass of one mole of a substance. It can be expressed as the atomic or molecular mass in grams. Hence, if you have a certain number of grams of a substance and you divide by its molar mass, you will determine the number of moles.

correct option a) Molar mass

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