Note that all formulas are case-sensitive. Did you mean to convert one of these similar formulas? You can do the reverse unit conversion from moles Nitric Acid to grams , or enter other units to convert below:. In chemistry, the formula weight is a quantity computed by multiplying the atomic weight in atomic mass units of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together. Using the chemical formula of the compound and the periodic table of elements, we can add up the atomic weights and calculate molecular weight of the substance.
We use the most common isotopes. This is how to calculate molar mass average molecular weight , which is based on isotropically weighted averages. This is not the same as molecular mass, which is the mass of a single molecule of well-defined isotopes. For bulk stoichiometric calculations, we are usually determining molar mass, which may also be called standard atomic weight or average atomic mass.
When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance. How to Calculate Millimolars.
How to Calculate End Point. How to Calculate Moles from Molecular Weight. How to Calculate the Stoichiometric Ratio. How to Calculate the Moles of a Compound. How to Calculate the Amount of Reactant in Excess. How to Calculate Millimoles to Milligrams. How to Calculate Particle Concentration. How to Calculate the Grams of Reactants in a Product.
How to Determine Moles in Chemistry. A common request on this site is to convert grams to moles. To complete this calculation, you have to know what substance you are trying to convert. The reason is that the molar mass of the substance affects the conversion. This site explains how to find molar mass. Using the chemical formula of the compound and the periodic table of elements, we can add up the atomic weights and calculate molecular weight of the substance.
If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom or group of atoms in the formula by the formula weight and multiplying by When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance.
The formula weight is simply the weight in atomic mass units of all the atoms in a given formula. We use the most common isotopes.
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