H77He9Li7Be88B99C100N67O34F7Ne9Na7Mg11Al8Si5P9S8Cl90Ar2K8Ca9 molar mass

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of H₇₇He₉Li₇Be₈₈B₉₉C₁₀₀N₆₇O₃₄F₇Ne₉Na₇Mg₁₁Al₈Si₅P₉S₈Cl₉₀Ar₂K₈Ca₉ is 10287.6889 g/mol

Convert between H₇₇He₉Li₇Be₈₈B₉₉C₁₀₀N₆₇O₃₄F₇Ne₉Na₇Mg₁₁Al₈Si₅P₉S₈Cl₉₀Ar₂K₈Ca₉ weight and moles

Compound	Moles		Weight, g
H₇₇He₉Li₇Be₈₈B₉₉C₁₀₀N₆₇O₃₄F₇Ne₉Na₇Mg₁₁Al₈Si₅P₉S₈Cl₉₀Ar₂K₈Ca₉

Elemental composition of H₇₇He₉Li₇Be₈₈B₉₉C₁₀₀N₆₇O₃₄F₇Ne₉Na₇Mg₁₁Al₈Si₅P₉S₈Cl₉₀Ar₂K₈Ca₉

Element	Symbol	Atomic weight	Atoms	Mass percent
Hydrogen	H	1.00794	77	0.7544
Helium	He	4.002602	9	0.3502
Lithium	Li	6.941	7	0.4723
Beryllium	Be	9.012182	88	7.7089
Boron	B	10.811	99	10.4036
Carbon	C	12.0107	100	11.6748
Nitrogen	N	14.0067	67	9.1221
Oxygen	O	15.9994	34	5.2877
Fluorine	F	18.9984032	7	1.2927
Neon	Ne	20.1797	9	1.7654
Sodium	Na	22.98976928	7	1.5643
Magnesium	Mg	24.3050	11	2.5988
Aluminum	Al	26.9815386	8	2.0982
Silicon	Si	28.0855	5	1.3650
Phosphorus	P	30.973762	9	2.7097
Sulfur	S	32.065	8	2.4935
Chlorine	Cl	35.453	90	31.0154
Argon	Ar	39.948	2	0.7766
Potassium	K	39.0983	8	3.0404
Calcium	Ca	40.078	9	3.5062

Computing molar mass step by step
First, compute the number of each atom in H₇₇He₉Li₇Be₈₈B₉₉C₁₀₀N₆₇O₃₄F₇Ne₉Na₇Mg₁₁Al₈Si₅P₉S₈Cl₉₀Ar₂K₈Ca₉: H: 77, He: 9, Li: 7, Be: 88, B: 99, C: 100, N: 67, O: 34, F: 7, Ne: 9, Na: 7, Mg: 11, Al: 8, Si: 5, P: 9, S: 8, Cl: 90, Ar: 2, K: 8, Ca: 9 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 (H₇₇He₉Li₇Be₈₈B₉₉C₁₀₀N₆₇O₃₄F₇Ne₉Na₇Mg₁₁Al₈Si₅P₉S₈Cl₉₀Ar₂K₈Ca₉) = ∑ 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) = 77 * 1.00794 + 9 * 4.002602 + 7 * 6.941 + 88 * 9.012182 + 99 * 10.811 + 100 * 12.0107 + 67 * 14.0067 + 34 * 15.9994 + 7 * 18.9984032 + 9 * 20.1797 + 7 * 22.98976928 + 11 * 24.305 + 8 * 26.9815386 + 5 * 28.0855 + 9 * 30.973762 + 8 * 32.065 + 90 * 35.453 + 2 * 39.948 + 8 * 39.0983 + 9 * 40.078 = 10287.6889 g/mol

Mass percent composition	Atomic percent composition

Formula in Hill system is C₁₀₀H₇₇Al₈Ar₂B₉₉Be₈₈Ca₉Cl₉₀F₇He₉K₈Li₇Mg₁₁N₆₇Na₇Ne₉O₃₄P₉S₈Si₅

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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