H2He2Li2Be2B2C2N2O2F2Ne2Na2Mg2Al2Si2P2S2Al2Ar2 molar mass

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of H₂He₂Li₂Be₂B₂C₂N₂O₂F₂Ne₂Na₂Mg₂Al₂Si₂P₂S₂Al₂Ar₂ is 690.5995 g/mol

Convert between H₂He₂Li₂Be₂B₂C₂N₂O₂F₂Ne₂Na₂Mg₂Al₂Si₂P₂S₂Al₂Ar₂ weight and moles

Compound	Moles		Weight, g
H₂He₂Li₂Be₂B₂C₂N₂O₂F₂Ne₂Na₂Mg₂Al₂Si₂P₂S₂Al₂Ar₂

Elemental composition of H₂He₂Li₂Be₂B₂C₂N₂O₂F₂Ne₂Na₂Mg₂Al₂Si₂P₂S₂Al₂Ar₂

Element	Symbol	Atomic weight	Atoms	Mass percent
Hydrogen	H	1.00794	2	0.2919
Helium	He	4.002602	2	1.1592
Lithium	Li	6.941	2	2.0101
Beryllium	Be	9.012182	2	2.6100
Boron	B	10.811	2	3.1309
Carbon	C	12.0107	2	3.4783
Nitrogen	N	14.0067	2	4.0564
Oxygen	O	15.9994	2	4.6335
Fluorine	F	18.9984032	2	5.5020
Neon	Ne	20.1797	2	5.8441
Sodium	Na	22.98976928	2	6.6579
Magnesium	Mg	24.3050	2	7.0388
Aluminum	Al	26.9815386	4	15.6279
Silicon	Si	28.0855	2	8.1337
Phosphorus	P	30.973762	2	8.9701
Sulfur	S	32.065	2	9.2861
Argon	Ar	39.948	2	11.5691

Computing molar mass step by step
First, compute the number of each atom in H₂He₂Li₂Be₂B₂C₂N₂O₂F₂Ne₂Na₂Mg₂Al₂Si₂P₂S₂Al₂Ar₂: 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: 4, Si: 2, P: 2, S: 2, Ar: 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, Ar: 39.948 Now, compute the sum of products of number of atoms to the atomic weight: Molar mass (H₂He₂Li₂Be₂B₂C₂N₂O₂F₂Ne₂Na₂Mg₂Al₂Si₂P₂S₂Al₂Ar₂) = ∑ 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(Ar) * Weight(Ar) = 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 + 4 * 26.9815386 + 2 * 28.0855 + 2 * 30.973762 + 2 * 32.065 + 2 * 39.948 = 690.5995 g/mol

Mass percent composition	Atomic percent composition

Formula in Hill system is C₂H₂Al₄Ar₂B₂Be₂F₂He₂Li₂Mg₂N₂Na₂Ne₂O₂P₂S₂Si₂

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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