# 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?

##### 1 Answer

#### Explanation:

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