H18He17Li16Be15B14C13N12O11F10Ne9Na8Mg7Al6Si5P4S3Cl2Ar1 molar mass

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of H₁₈He₁₇Li₁₆Be₁₅B₁₄C₁₃N₁₂O₁₁F₁₀Ne₉Na₈Mg₇Al₆Si₅P₄S₃Cl₂Ar₁ is 2342.9080 g/mol

Convert between H₁₈He₁₇Li₁₆Be₁₅B₁₄C₁₃N₁₂O₁₁F₁₀Ne₉Na₈Mg₇Al₆Si₅P₄S₃Cl₂Ar₁ weight and moles

Compound	Moles		Weight, g
H₁₈He₁₇Li₁₆Be₁₅B₁₄C₁₃N₁₂O₁₁F₁₀Ne₉Na₈Mg₇Al₆Si₅P₄S₃Cl₂Ar₁

Elemental composition of H₁₈He₁₇Li₁₆Be₁₅B₁₄C₁₃N₁₂O₁₁F₁₀Ne₉Na₈Mg₇Al₆Si₅P₄S₃Cl₂Ar₁

Element	Symbol	Atomic weight	Atoms	Mass percent
Hydrogen	H	1.00794	18	0.7744
Helium	He	4.002602	17	2.9043
Lithium	Li	6.941	16	4.7401
Beryllium	Be	9.012182	15	5.7699
Boron	B	10.811	14	6.4601
Carbon	C	12.0107	13	6.6643
Nitrogen	N	14.0067	12	7.1740
Oxygen	O	15.9994	11	7.5118
Fluorine	F	18.9984032	10	8.1089
Neon	Ne	20.1797	9	7.7518
Sodium	Na	22.98976928	8	7.8500
Magnesium	Mg	24.3050	7	7.2617
Aluminum	Al	26.9815386	6	6.9098
Silicon	Si	28.0855	5	5.9937
Phosphorus	P	30.973762	4	5.2881
Sulfur	S	32.065	3	4.1058
Chlorine	Cl	35.453	2	3.0264
Argon	Ar	39.948	1	1.7051

Computing molar mass step by step
First, compute the number of each atom in H₁₈He₁₇Li₁₆Be₁₅B₁₄C₁₃N₁₂O₁₁F₁₀Ne₉Na₈Mg₇Al₆Si₅P₄S₃Cl₂Ar₁: H: 18, He: 17, Li: 16, Be: 15, B: 14, C: 13, N: 12, O: 11, F: 10, Ne: 9, Na: 8, Mg: 7, Al: 6, Si: 5, P: 4, S: 3, Cl: 2, Ar: 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 Now, compute the sum of products of number of atoms to the atomic weight: Molar mass (H₁₈He₁₇Li₁₆Be₁₅B₁₄C₁₃N₁₂O₁₁F₁₀Ne₉Na₈Mg₇Al₆Si₅P₄S₃Cl₂Ar₁) = ∑ 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) = 18 * 1.00794 + 17 * 4.002602 + 16 * 6.941 + 15 * 9.012182 + 14 * 10.811 + 13 * 12.0107 + 12 * 14.0067 + 11 * 15.9994 + 10 * 18.9984032 + 9 * 20.1797 + 8 * 22.98976928 + 7 * 24.305 + 6 * 26.9815386 + 5 * 28.0855 + 4 * 30.973762 + 3 * 32.065 + 2 * 35.453 + 1 * 39.948 = 2342.9080 g/mol

Mass percent composition	Atomic percent composition

Formula in Hill system is C₁₃H₁₈Al₆ArB₁₄Be₁₅Cl₂F₁₀He₁₇Li₁₆Mg₇N₁₂Na₈Ne₉O₁₁P₄S₃Si₅

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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