Co-Authored By:

**grams**numerically equal to themolecularweight contains one mole of

**molecules**, which isknown to be6.02 x 10^23 (Avogadro's number). So if you have x

**grams**of asubstance, and the molecular weight is y, thenthe number of moles n= x/y and the number of

**molecules**= nmultiplied byAvogadro's number.

Besides, how do you find grams in molecules?

Once you know the molecular weight of a compound,youknow how much Avogadro's number of that compound weighsin**grams**. To **find** the number of **molecules** inasample, divide the weight of the sample by the weight of onemoleto get the number of moles, then multiply byAvogadro'snumber.

**gram molecule**(plural

**grammolecules**)(chemistry) The amount of a compound whose mass in

**grams**isthat of its

**molecular**weight; a

**mole**.

Simply so, how do you calculate molecules?

Multiply Moles by the Avogadro Constant Multiply the number of moles by the Avogadroconstant,6.022 x 10^23, to **calculate** the number of**molecules**in your sample. In the example, the number of**molecules** ofNa2SO4 is 0.141 x 6.022 x 10^23, or 8.491 x10^22 **molecules**of Na2SO4.

The **molecular weight** is given in unitsof**grams** per mole – the number of **grams** inonemole of the compound. To **convert** moles to**grams**,multiply by the **molecular weight**; to **convertgrams** tomoles, divide by the **molecularweight**.