Thus the mass m of substance in grams is equal to the quantity n in moles multiplied by the molar mass M of the substance in g/mol.įor example, let’s calculate the mass of 2 moles of table salt, sodium chloride or NaCl. The formula used to convert moles to grams is: However, the calculator above will automatically calculate the molar mass for you. You can use a molar mass calculator for this calculation if you don’t have a reference handy. ![]() You can either use the molar mass of the entire substance, or you can calculate the molar mass of the substance by adding together the atomic masses of each element that makes up that substance. Molar mass, represented in g/mol, will be needed along with the formula below to convert moles to grams or vice versa. Because every substance is composed of different atomic elements, the atomic mass of each element in a compound or molecule is added together to determine its molar mass. The first step in the conversion is to find the molar mass of the compound. Grams are used to measure out the reactants and to check the yield of the products in a reaction.Īt this point, you might be wondering how to convert moles, which are used in chemical formulas, to grams, which is how much of each compound you’ll need to carry out the reaction in a laboratory. Moles are normally used in chemical formulas to represent the relative amount of each substance in the formula – in other words, how many moles of each reactant are needed to make a certain number of moles of product. Moles count the number of atoms or molecules in a sample, while grams represent the weight of the sample. Because that’s such a large number, it’s almost always represented using scientific notation. ![]() One mole is equal to 6.02214076 × 10 23 elementary units of matter, such as atoms or molecules. A gram is an SI unit of measurement for mass equal to 1/1,000 of a kilogram, and the mole is the SI base unit used to represent the quantity of a substance. Our atoms to moles calculator easily converts atoms or molecules to moles.Grams and moles are both units used in chemistry to measure matter in different ways. The quantity of substance in moles is equal to the number of molecules divided by the Avogadro constant (6.02214076 × 10 23). The formula for converting molecules to moles is a little different than mass and volume because both molecules and moles are measures of quantity: You can also use our liters to moles calculator for this conversion. This convention is used for most calculations involving gasses and is intended to represent conditions at sea level. This relationship between liters and moles holds true at standard temperature and pressure (STP) since both temperature and pressure affect the volume of a gas. The quantity of a substance in moles is equal to the volume in liters of the ideal gas divided by 22.4 L/mol. You’ll still use a formula, but you do not need the molar mass of the gas for the conversion. The process for converting the volume of an ideal gas to moles is a little different than for mass. You can use the calculator above to calculate this more easily or even our grams to moles calculator to quickly convert grams to moles and moles back to mass. So, in this example, the quantity of 120 grams of aluminum oxide equals 1.18 moles. Note that the molar mass of aluminum oxide is 101.96 g/mol. Therefore, you need to be able to convert from weight and volume to moles and vice versa to conduct experiments in a laboratory or carry out reactions to manufacture products in industry.įor example, let’s calculate the quantity in moles equal to 120 grams of aluminum oxide, Al 2O 3. Using moles in chemical equations shows exactly how the reactants transform to make the products. However, most chemical equations are written in terms of moles so that the number of atoms of each type balances out on both sides of the equation. This conversion is useful because most chemicals are stored and measured either by weight (g) or volume (L). Below we’ll also cover how to convert volume and molecules to moles as well. Follow along, and we’ll show you how to convert mass to moles in just a few steps. You might be wondering how you can calculate the number of moles given a mass, volume, or amount of substance. Since the mole is a measure of quantity, all substances have the same number of atoms, molecules, and other particles in one mole of the substance. Because it’s such a large number, scientific notation is almost always used to represent it. ![]() This numerical value is known as the Avogadro constant or Avogadro’s number. One mole is equal to 6.02214076 × 10 23 elementary entities, such as atoms, molecules, electrons, or ions. ![]() It’s used as a standard measurement for a very large quantity of very small units of matter. The mole, abbreviated mol, is the SI base unit to measure the amount or quantity of a substance.
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