# How to convert grams to moles In this particular lesson, the moles of the substance (lower left) will be the unknown (which will be signified by the letter x). The exact same proportion is used in the moles-to-grams conversion lesson. Then the x will reside in the upper left. How to Convert Grams to Moles Steps to Convert Grams to Moles. Share Flipboard Email Print Grams and moles are two ways to express mass. Tomasz Sienicki, Creative Commons Science. Chemistry Basics Chemical Laws Molecules Periodic Table Projects & Experiments Scientific Method The mole is a standard unit in chemistry and is a way to measure the amount of a substance. In this lesson, we will learn how to convert the amount. How to Convert Grams to Moles. Explore this Article. parts. 1 Calculating the Molecular Mass 2 Converting Grams to Moles Other Sections. Questions & Answers Video Tips and Warnings Things You'll Need Related Articles References Article Summary Co-authored by Bess. ››Definition: Mole. The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12; its symbol is mol. For chemistry you often need to convert moles to grams and grams to moles. There is a simple relation between these two:, where - mass of the substance in grams In order to determine the number of moles of a given compound, the first thing you need to do is find the molecular mass (or molecular weight) of the compound in question. Once you've done that, you need to determine how much the compound weighs physically (in grams). After you get both of these values, you need to divide the physical weight of the compound by its molecular weight. This video discusses how to convert moles to grams. To do moles to grams conversion, you need to use the molar mass which can be found using the periodic table. You can also calculate the grams by. How to Convert Grams to Moles and Vice Versa Here's how to make mole-to-gram and gram-to-mole conversions. Share Flipboard Email Print Compounds are weighed using scales to yield grams. It's often necessary to convert grams to moles for chemistry calculations. Peter Muller / Getty Images Science. Chemistry