H16He4Li7Be5B7C65N6O4Ne7Na4Mg3Al1Si1P6S4Cl6Ar7K8Ca54Sc757 molar mass

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of H₁₆He₄Li₇Be₅B₇C₆₅N₆O₄Ne₇Na₄Mg₃Al₁Si₁P₆S₄Cl₆Ar₇K₈Ca₅₄Sc₇₅₇ is 38806.4750 g/mol

Convert between H₁₆He₄Li₇Be₅B₇C₆₅N₆O₄Ne₇Na₄Mg₃Al₁Si₁P₆S₄Cl₆Ar₇K₈Ca₅₄Sc₇₅₇ weight and moles

Compound	Moles		Weight, g
H₁₆He₄Li₇Be₅B₇C₆₅N₆O₄Ne₇Na₄Mg₃Al₁Si₁P₆S₄Cl₆Ar₇K₈Ca₅₄Sc₇₅₇

Elemental composition of H₁₆He₄Li₇Be₅B₇C₆₅N₆O₄Ne₇Na₄Mg₃Al₁Si₁P₆S₄Cl₆Ar₇K₈Ca₅₄Sc₇₅₇

Element	Symbol	Atomic weight	Atoms	Mass percent
Hydrogen	H	1.00794	16	0.0416
Helium	He	4.002602	4	0.0413
Lithium	Li	6.941	7	0.1252
Beryllium	Be	9.012182	5	0.1161
Boron	B	10.811	7	0.1950
Carbon	C	12.0107	65	2.0118
Nitrogen	N	14.0067	6	0.2166
Oxygen	O	15.9994	4	0.1649
Neon	Ne	20.1797	7	0.3640
Sodium	Na	22.98976928	4	0.2370
Magnesium	Mg	24.3050	3	0.1879
Aluminum	Al	26.9815386	1	0.0695
Silicon	Si	28.0855	1	0.0724
Phosphorus	P	30.973762	6	0.4789
Sulfur	S	32.065	4	0.3305
Chlorine	Cl	35.453	6	0.5482
Argon	Ar	39.948	7	0.7206
Potassium	K	39.0983	8	0.8060
Calcium	Ca	40.078	54	5.5769
Scandium	Sc	44.955912	757	87.6957

Computing molar mass step by step
First, compute the number of each atom in H₁₆He₄Li₇Be₅B₇C₆₅N₆O₄Ne₇Na₄Mg₃Al₁Si₁P₆S₄Cl₆Ar₇K₈Ca₅₄Sc₇₅₇: H: 16, He: 4, Li: 7, Be: 5, B: 7, C: 65, N: 6, O: 4, Ne: 7, Na: 4, Mg: 3, Al: 1, Si: 1, P: 6, S: 4, Cl: 6, Ar: 7, K: 8, Ca: 54, Sc: 757 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, 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, Sc: 44.955912 Now, compute the sum of products of number of atoms to the atomic weight: Molar mass (H₁₆He₄Li₇Be₅B₇C₆₅N₆O₄Ne₇Na₄Mg₃Al₁Si₁P₆S₄Cl₆Ar₇K₈Ca₅₄Sc₇₅₇) = ∑ 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(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) + Count(Sc) * Weight(Sc) = 16 * 1.00794 + 4 * 4.002602 + 7 * 6.941 + 5 * 9.012182 + 7 * 10.811 + 65 * 12.0107 + 6 * 14.0067 + 4 * 15.9994 + 7 * 20.1797 + 4 * 22.98976928 + 3 * 24.305 + 1 * 26.9815386 + 1 * 28.0855 + 6 * 30.973762 + 4 * 32.065 + 6 * 35.453 + 7 * 39.948 + 8 * 39.0983 + 54 * 40.078 + 757 * 44.955912 = 38806.4750 g/mol

Mass percent composition	Atomic percent composition

Formula in Hill system is C₆₅H₁₆AlAr₇B₇Be₅Ca₅₄Cl₆He₄K₈Li₇Mg₃N₆Na₄Ne₇O₄P₆S₄Sc₇₅₇Si

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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