H19He18Li17Be16B15C14N13O12F11Ne10Na9Mg8Al7Si6P5S4Cl3Ar2K1 molar mass

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of H₁₉He₁₈Li₁₇Be₁₆B₁₅C₁₄N₁₃O₁₂F₁₁Ne₁₀Na₉Mg₈Al₇Si₆P₅S₄Cl₃Ar₂K₁ is 2735.7775 g/mol

Convert between H₁₉He₁₈Li₁₇Be₁₆B₁₅C₁₄N₁₃O₁₂F₁₁Ne₁₀Na₉Mg₈Al₇Si₆P₅S₄Cl₃Ar₂K₁ weight and moles

Compound	Moles		Weight, g
H₁₉He₁₈Li₁₇Be₁₆B₁₅C₁₄N₁₃O₁₂F₁₁Ne₁₀Na₉Mg₈Al₇Si₆P₅S₄Cl₃Ar₂K₁

Elemental composition of H₁₉He₁₈Li₁₇Be₁₆B₁₅C₁₄N₁₃O₁₂F₁₁Ne₁₀Na₉Mg₈Al₇Si₆P₅S₄Cl₃Ar₂K₁

Element	Symbol	Atomic weight	Atoms	Mass percent
Hydrogen	H	1.00794	19	0.7000
Helium	He	4.002602	18	2.6335
Lithium	Li	6.941	17	4.3131
Beryllium	Be	9.012182	16	5.2707
Boron	B	10.811	15	5.9276
Carbon	C	12.0107	14	6.1463
Nitrogen	N	14.0067	13	6.6558
Oxygen	O	15.9994	12	7.0179
Fluorine	F	18.9984032	11	7.6389
Neon	Ne	20.1797	10	7.3762
Sodium	Na	22.98976928	9	7.5630
Magnesium	Mg	24.3050	8	7.1073
Aluminum	Al	26.9815386	7	6.9037
Silicon	Si	28.0855	6	6.1596
Phosphorus	P	30.973762	5	5.6609
Sulfur	S	32.065	4	4.6882
Chlorine	Cl	35.453	3	3.8877
Argon	Ar	39.948	2	2.9204
Potassium	K	39.0983	1	1.4291

Computing molar mass step by step
First, compute the number of each atom in H₁₉He₁₈Li₁₇Be₁₆B₁₅C₁₄N₁₃O₁₂F₁₁Ne₁₀Na₉Mg₈Al₇Si₆P₅S₄Cl₃Ar₂K₁: H: 19, He: 18, Li: 17, Be: 16, B: 15, C: 14, N: 13, O: 12, F: 11, Ne: 10, Na: 9, Mg: 8, Al: 7, Si: 6, P: 5, S: 4, Cl: 3, Ar: 2, K: 1 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 Now, compute the sum of products of number of atoms to the atomic weight: Molar mass (H₁₉He₁₈Li₁₇Be₁₆B₁₅C₁₄N₁₃O₁₂F₁₁Ne₁₀Na₉Mg₈Al₇Si₆P₅S₄Cl₃Ar₂K₁) = ∑ 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) = 19 * 1.00794 + 18 * 4.002602 + 17 * 6.941 + 16 * 9.012182 + 15 * 10.811 + 14 * 12.0107 + 13 * 14.0067 + 12 * 15.9994 + 11 * 18.9984032 + 10 * 20.1797 + 9 * 22.98976928 + 8 * 24.305 + 7 * 26.9815386 + 6 * 28.0855 + 5 * 30.973762 + 4 * 32.065 + 3 * 35.453 + 2 * 39.948 + 1 * 39.0983 = 2735.7775 g/mol

Mass percent composition	Atomic percent composition

Formula in Hill system is C₁₄H₁₉Al₇Ar₂B₁₅Be₁₆Cl₃F₁₁He₁₈KLi₁₇Mg₈N₁₃Na₉Ne₁₀O₁₂P₅S₄Si₆

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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