H1He2Li3Be4B5C6N7O8F9Ne10Na11Mg12Al13Si14P15S16Cl17Ar18K19 molar mass

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of H₁He₂Li₃Be₄B₅C₆N₇O₈F₉Ne₁₀Na₁₁Mg₁₂Al₁₃Si₁₄P₁₅S₁₆Cl₁₇Ar₁₈K₁₉ is 5121.6124 g/mol

Convert between H₁He₂Li₃Be₄B₅C₆N₇O₈F₉Ne₁₀Na₁₁Mg₁₂Al₁₃Si₁₄P₁₅S₁₆Cl₁₇Ar₁₈K₁₉ weight and moles

Compound	Moles		Weight, g
H₁He₂Li₃Be₄B₅C₆N₇O₈F₉Ne₁₀Na₁₁Mg₁₂Al₁₃Si₁₄P₁₅S₁₆Cl₁₇Ar₁₈K₁₉

Elemental composition of H₁He₂Li₃Be₄B₅C₆N₇O₈F₉Ne₁₀Na₁₁Mg₁₂Al₁₃Si₁₄P₁₅S₁₆Cl₁₇Ar₁₈K₁₉

Element	Symbol	Atomic weight	Atoms	Mass percent
Hydrogen	H	1.00794	1	0.0197
Helium	He	4.002602	2	0.1563
Lithium	Li	6.941	3	0.4066
Beryllium	Be	9.012182	4	0.7039
Boron	B	10.811	5	1.0554
Carbon	C	12.0107	6	1.4071
Nitrogen	N	14.0067	7	1.9144
Oxygen	O	15.9994	8	2.4991
Fluorine	F	18.9984032	9	3.3385
Neon	Ne	20.1797	10	3.9401
Sodium	Na	22.98976928	11	4.9377
Magnesium	Mg	24.3050	12	5.6947
Aluminum	Al	26.9815386	13	6.8486
Silicon	Si	28.0855	14	7.6772
Phosphorus	P	30.973762	15	9.0715
Sulfur	S	32.065	16	10.0172
Chlorine	Cl	35.453	17	11.7678
Argon	Ar	39.948	18	14.0398
Potassium	K	39.0983	19	14.5046

Computing molar mass step by step
First, compute the number of each atom in H₁He₂Li₃Be₄B₅C₆N₇O₈F₉Ne₁₀Na₁₁Mg₁₂Al₁₃Si₁₄P₁₅S₁₆Cl₁₇Ar₁₈K₁₉: H: 1, He: 2, Li: 3, Be: 4, B: 5, C: 6, N: 7, O: 8, F: 9, Ne: 10, Na: 11, Mg: 12, Al: 13, Si: 14, P: 15, S: 16, Cl: 17, Ar: 18, K: 19 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 (H₁He₂Li₃Be₄B₅C₆N₇O₈F₉Ne₁₀Na₁₁Mg₁₂Al₁₃Si₁₄P₁₅S₁₆Cl₁₇Ar₁₈K₁₉) = ∑ 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) = 1 * 1.00794 + 2 * 4.002602 + 3 * 6.941 + 4 * 9.012182 + 5 * 10.811 + 6 * 12.0107 + 7 * 14.0067 + 8 * 15.9994 + 9 * 18.9984032 + 10 * 20.1797 + 11 * 22.98976928 + 12 * 24.305 + 13 * 26.9815386 + 14 * 28.0855 + 15 * 30.973762 + 16 * 32.065 + 17 * 35.453 + 18 * 39.948 + 19 * 39.0983 = 5121.6124 g/mol

Mass percent composition	Atomic percent composition

Formula in Hill system is C₆HAl₁₃Ar₁₈B₅Be₄Cl₁₇F₉He₂K₁₉Li₃Mg₁₂N₇Na₁₁Ne₁₀O₈P₁₅S₁₆Si₁₄

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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