## Percent composition by element

Element: Chlorine
Symbol: Cl
Atomic Mass: 35.453# of Atoms: 2Mass Percent: 54.966%

Element: Calcium
Symbol: Ca
Atomic Mass: 40.078# of Atoms: 1Mass Percent: 31.068%

Element: Hydrogen
Symbol: HAtomic Mass: 1.00794# of Atoms: 2Mass Percent: 1.563%

Element: Oxygen
Symbol: OAtomic Mass: 15.9994# of Atoms: 1Mass Percent: 12.403%

## Calculate themolecular weight of a chemical compound

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Browse the list ofcommon chemical compounds.

Bạn đang xem: Cacl2 + h2o → cao + 2 hcl

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.

A common request on this site is to lớn convert grams to lớn moles. To lớn complete this calculation, you have to lớn know what substance you are trying to lớn convert. The reason is that the molar mass of the substance affects the conversion. This site explains how to find molar mass.

Formula weights are especially useful in determining the relative weights of reagents và products in a chemical reaction. These relative weights computed from the chemical equation are sometimes called equation weights.

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 và multiplying by 100.

Using the chemical formula of the compound & the periodic table of elements, we can add up the atomic weights và calculate molecular weight of the substance.

Finding molar mass starts with units of grams per mole (g/mol). 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.

The atomic weights used on this site come from NIST, the National Institute of Standards & Technology. We use the most common isotopes. This is how lớn 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.

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Ca
Cl2(H2O)2
 Enter a chemical formula to calculate its molar mass & elemental composition: Molar mass of CaCl2(H2O)2 is 147.0146 g/mol Convert between CaCl2(H2O)2 weight và molesCompoundMolesWeight, g
Elemental composition of Ca
Cl2(H2O)2Element
Symbol
Atomic weight
Atoms
Mass percent
 Calcium Ca 40.078 1 27.2612 Chlorine Cl 35.453 2 48.2306 Hydrogen H 1.00794 4 2.7424 Oxygen O 15.9994 2 21.7657
Mass percent composition
Atomic percent composition

Formula in Hill system is Ca
Cl2H4O2

### 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. Capitalize the first letter in chemical symbol & use lower case for the remaining letters: Ca, Fe, Mg, Mn, S, O, H, C, N, Na, K, Cl, Al.Functional groups: D, Ph, Me, Et, Bu, Ac
Ac, For, Ts, Tos, Bz, TMS, t
Bu, Bzl, Bn, Dmgparantesis () or brackets <>.Common compound names.Examples of molar mass computations: Na
Cl, Ca(OH)2, K4,Cu
SO4*5H2O,water,nitric acid,potassium permanganate,ethanol,fructose.Molar mass calculator also displays common compound name, Hill formula, elemental composition, mass percent composition, atomic percent compositions and allows khổng lồ convert from weight lớn number of moles & 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). (1 u is equal khổng lồ 1/12 the mass of one atom of carbon-12) Molar mass (molar weight) is the mass of one mole of a substance and is expressed in g/mol.Weights of atoms & isotopes are from NIST article.Related: Molecular weights of amino acidsmolecular weights calculated today Please let us know how we can improve this website app. Chemistrytools
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