Question

Convert 20g of chocolate cookies crums to mole.
Molar formula/ mass of choc= 12008/mol
Setup 2 conversions factors
Choose 1 conversion factors
Multiply 20g by the conversion factor
Solve

Answer 1

Molar mass gives us our conversion factor. It tells us how many grams of a substance equals 1 mole.

Your question tells us that the molar formula/mass of chocolate cookies is 12008 grams / mole

That's your first conversion factor. The second conversion factor is that same thing but flipped.

Do you see the 2 conversion factors?

Answer 2

Now which one do you choose? We want to multiply it by 20 g
So we want the `g` to cancel out so that way we're left with `mol` and that will tell us how many how many moles there are in 20g of chocolate cookies crums

So which conversion factor has `g` in the denominator (or the bottom part of the fraction)?