H2He2Li2Be2B2C2N2O2F2Ne2Na2Mg2Al2Si2P2S2Cl2Ar2K2Ca2 molar mass

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of H₂He₂Li₂Be₂B₂C₂N₂O₂F₂Ne₂Na₂Mg₂Al₂Si₂P₂S₂Cl₂Ar₂K₂Ca₂ is 865.8950 g/mol

Convert between H₂He₂Li₂Be₂B₂C₂N₂O₂F₂Ne₂Na₂Mg₂Al₂Si₂P₂S₂Cl₂Ar₂K₂Ca₂ weight and moles

Compound	Moles		Weight, g
H₂He₂Li₂Be₂B₂C₂N₂O₂F₂Ne₂Na₂Mg₂Al₂Si₂P₂S₂Cl₂Ar₂K₂Ca₂

Elemental composition of H₂He₂Li₂Be₂B₂C₂N₂O₂F₂Ne₂Na₂Mg₂Al₂Si₂P₂S₂Cl₂Ar₂K₂Ca₂

Element	Symbol	Atomic weight	Atoms	Mass percent
Hydrogen	H	1.00794	2	0.2328
Helium	He	4.002602	2	0.9245
Lithium	Li	6.941	2	1.6032
Beryllium	Be	9.012182	2	2.0816
Boron	B	10.811	2	2.4971
Carbon	C	12.0107	2	2.7742
Nitrogen	N	14.0067	2	3.2352
Oxygen	O	15.9994	2	3.6955
Fluorine	F	18.9984032	2	4.3882
Neon	Ne	20.1797	2	4.6610
Sodium	Na	22.98976928	2	5.3101
Magnesium	Mg	24.3050	2	5.6138
Aluminum	Al	26.9815386	2	6.2321
Silicon	Si	28.0855	2	6.4870
Phosphorus	P	30.973762	2	7.1542
Sulfur	S	32.065	2	7.4062
Chlorine	Cl	35.453	2	8.1888
Argon	Ar	39.948	2	9.2270
Potassium	K	39.0983	2	9.0307
Calcium	Ca	40.078	2	9.2570

Computing molar mass step by step
First, compute the number of each atom in H₂He₂Li₂Be₂B₂C₂N₂O₂F₂Ne₂Na₂Mg₂Al₂Si₂P₂S₂Cl₂Ar₂K₂Ca₂: H: 2, He: 2, Li: 2, Be: 2, B: 2, C: 2, N: 2, O: 2, F: 2, Ne: 2, Na: 2, Mg: 2, Al: 2, Si: 2, P: 2, S: 2, Cl: 2, Ar: 2, K: 2, Ca: 2 Then, lookup atomic weights for each element in periodic table: H: 1.00794, He: 4.002602, Li: 6.941, Be: 9.012182, B: 10.811, C: 12.0107, N: 14.0067, O: 15.9994, F: 18.9984032, Ne: 20.1797, Na: 22.98976928, Mg: 24.305, Al: 26.9815386, Si: 28.0855, P: 30.973762, S: 32.065, Cl: 35.453, Ar: 39.948, K: 39.0983, Ca: 40.078 Now, compute the sum of products of number of atoms to the atomic weight: Molar mass (H₂He₂Li₂Be₂B₂C₂N₂O₂F₂Ne₂Na₂Mg₂Al₂Si₂P₂S₂Cl₂Ar₂K₂Ca₂) = ∑ Count_i * Weight_i = Count(H) * Weight(H) + Count(He) * Weight(He) + Count(Li) * Weight(Li) + Count(Be) * Weight(Be) + Count(B) * Weight(B) + Count(C) * Weight(C) + Count(N) * Weight(N) + Count(O) * Weight(O) + Count(F) * Weight(F) + Count(Ne) * Weight(Ne) + Count(Na) * Weight(Na) + Count(Mg) * Weight(Mg) + Count(Al) * Weight(Al) + Count(Si) * Weight(Si) + Count(P) * Weight(P) + Count(S) * Weight(S) + Count(Cl) * Weight(Cl) + Count(Ar) * Weight(Ar) + Count(K) * Weight(K) + Count(Ca) * Weight(Ca) = 2 * 1.00794 + 2 * 4.002602 + 2 * 6.941 + 2 * 9.012182 + 2 * 10.811 + 2 * 12.0107 + 2 * 14.0067 + 2 * 15.9994 + 2 * 18.9984032 + 2 * 20.1797 + 2 * 22.98976928 + 2 * 24.305 + 2 * 26.9815386 + 2 * 28.0855 + 2 * 30.973762 + 2 * 32.065 + 2 * 35.453 + 2 * 39.948 + 2 * 39.0983 + 2 * 40.078 = 865.8950 g/mol

Mass percent composition	Atomic percent composition

Formula in Hill system is C₂H₂Al₂Ar₂B₂Be₂Ca₂Cl₂F₂He₂K₂Li₂Mg₂N₂Na₂Ne₂O₂P₂S₂Si₂

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 and use lower case for the remaining letters: Ca, Fe, Mg, Mn, S, O, H, C, N, Na, K, Cl, Al.
Functional groups: D, T, Ph, Me, Et, Bu, AcAc, For, Tos, Bz, TMS, tBu, Bzl, Bn, Dmg
parenthesis () or brackets [].
Common compound names.

Examples of molar mass computations: NaCl, Ca(OH)2, K4[Fe(CN)6], CuSO4*5H2O, nitric acid, potassium permanganate, ethanol, fructose, caffeine, water.

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

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 to 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.
Mole is a standard scientific unit for measuring large quantities of very small entities such as atoms and molecules. One mole contains exactly 6.022 ×10²³ particles (Avogadro's number)

Steps to calculate molar mass

Identify the compound: write down the chemical formula of the compound. For example, water is H₂O, meaning it contains two hydrogen atoms and one oxygen atom.
Find atomic masses: look up the atomic masses of each element present in the compound. The atomic mass is usually found on the periodic table and is given in atomic mass units (amu).
Calculate molar mass of each element: multiply the atomic mass of each element by the number of atoms of that element in the compound.
Add them together: add the results from step 3 to get the total molar mass of the compound.

Example: calculating molar mass

Let's calculate the molar mass of carbon dioxide (CO₂):

Carbon (C) has an atomic mass of about 12.01 amu.
Oxygen (O) has an atomic mass of about 16.00 amu.
CO₂ has one carbon atom and two oxygen atoms.
The molar mass of carbon dioxide is 12.01 + (2 × 16.00) = 44.01 g/mol.

Lesson on computing molar mass

Weights of atoms and isotopes are from NIST article.

molecular weights calculated today

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