A sample of a pure substance with a mass of 0.963g contains 4.84x1-^-3 moles. What is the formula weight of the substance comprising the sample?
We're asked to calculate the formula weight of a pure substance, knowing that
To calculate the formula weight (relative atomic mass, atomic weight, etc.; they mean the same thing), we'll first calculate the *molar mass of the substance:
Remember the important conecpt of the mole:
The mass in grams of one mole of a substance is equal to the mass in atomic mass units of one individual unit of that substance.
Therefore, we have