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 Formula weights are especially useful in determining the relative weights of reagents and products in a chemical reaction.
These relative weights computed from the chemical equation are sometimes called equation weights. 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. We use the most common isotopes. Computing molar mass molar weight To calculate molar mass of a chemical compound enter its formula and click 'Compute'.
In chemical formula you may use: Any chemical element. Common compound names. Molar mass calculator also displays common compound name, Hill formula, elemental composition, mass percent composition, atomic percent compositions and allows to convert from weight to number of moles and vice versa.
Computing molecular weight molecular mass To calculate molecular weight of a chemical compound enter it's formula, specify its isotope mass number after each element in square brackets. Examples of molecular weight computations: C[14]O[16]2 , S[34]O[16]2. Definitions of molecular mass, molecular weight, molar mass and molar weight Molecular mass molecular weight is the mass of one molecule of a substance and is expressed in the unified atomic mass units u.
Weights of atoms and isotopes are from NIST article. Related: Molecular weights of amino acids. Chemistry tools.
0コメント