H457He114Li76BeBCN33O29FNeNaMgAlSiPSClArKCaScTiVCrMnFeCoNiCu molar mass

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of H₄₅₇He₁₁₄Li₇₆BeBCN₃₃O₂₉FNeNaMgAlSiPSClArKCaScTiVCrMnFeCoNiCu is 3249.3509 g/mol

Convert between H₄₅₇He₁₁₄Li₇₆BeBCN₃₃O₂₉FNeNaMgAlSiPSClArKCaScTiVCrMnFeCoNiCu weight and moles

Compound	Moles		Weight, g
H₄₅₇He₁₁₄Li₇₆BeBCN₃₃O₂₉FNeNaMgAlSiPSClArKCaScTiVCrMnFeCoNiCu

Elemental composition of H₄₅₇He₁₁₄Li₇₆BeBCN₃₃O₂₉FNeNaMgAlSiPSClArKCaScTiVCrMnFeCoNiCu

Element	Symbol	Atomic weight	Atoms	Mass percent
Hydrogen	H	1.00794	457	14.1760
Helium	He	4.002602	114	14.0427
Lithium	Li	6.941	76	16.2345
Beryllium	Be	9.012182	1	0.2774
Boron	B	10.811	1	0.3327
Carbon	C	12.0107	1	0.3696
Nitrogen	N	14.0067	33	14.2250
Oxygen	O	15.9994	29	14.2792
Fluorine	F	18.9984032	1	0.5847
Neon	Ne	20.1797	1	0.6210
Sodium	Na	22.98976928	1	0.7075
Magnesium	Mg	24.3050	1	0.7480
Aluminum	Al	26.9815386	1	0.8304
Silicon	Si	28.0855	1	0.8643
Phosphorus	P	30.973762	1	0.9532
Sulfur	S	32.065	1	0.9868
Chlorine	Cl	35.453	1	1.0911
Argon	Ar	39.948	1	1.2294
Potassium	K	39.0983	1	1.2033
Calcium	Ca	40.078	1	1.2334
Scandium	Sc	44.955912	1	1.3835
Titanium	Ti	47.867	1	1.4731
Vanadium	V	50.9415	1	1.5677
Chromium	Cr	51.9961	1	1.6002
Manganese	Mn	54.938045	1	1.6907
Iron	Fe	55.845	1	1.7187
Cobalt	Co	58.933195	1	1.8137
Nickel	Ni	58.6934	1	1.8063
Copper	Cu	63.546	1	1.9557

Computing molar mass step by step
First, compute the number of each atom in H₄₅₇He₁₁₄Li₇₆BeBCN₃₃O₂₉FNeNaMgAlSiPSClArKCaScTiVCrMnFeCoNiCu: H: 457, He: 114, Li: 76, Be: 1, B: 1, C: 1, N: 33, O: 29, F: 1, Ne: 1, Na: 1, Mg: 1, Al: 1, Si: 1, P: 1, S: 1, Cl: 1, Ar: 1, K: 1, Ca: 1, Sc: 1, Ti: 1, V: 1, Cr: 1, Mn: 1, Fe: 1, Co: 1, Ni: 1, Cu: 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, Ca: 40.078, Sc: 44.955912, Ti: 47.867, V: 50.9415, Cr: 51.9961, Mn: 54.938045, Fe: 55.845, Co: 58.933195, Ni: 58.6934, Cu: 63.546 Now, compute the sum of products of number of atoms to the atomic weight: Molar mass (H₄₅₇He₁₁₄Li₇₆BeBCN₃₃O₂₉FNeNaMgAlSiPSClArKCaScTiVCrMnFeCoNiCu) = ∑ 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) + Count(Sc) * Weight(Sc) + Count(Ti) * Weight(Ti) + Count(V) * Weight(V) + Count(Cr) * Weight(Cr) + Count(Mn) * Weight(Mn) + Count(Fe) * Weight(Fe) + Count(Co) * Weight(Co) + Count(Ni) * Weight(Ni) + Count(Cu) * Weight(Cu) = 457 * 1.00794 + 114 * 4.002602 + 76 * 6.941 + 1 * 9.012182 + 1 * 10.811 + 1 * 12.0107 + 33 * 14.0067 + 29 * 15.9994 + 1 * 18.9984032 + 1 * 20.1797 + 1 * 22.98976928 + 1 * 24.305 + 1 * 26.9815386 + 1 * 28.0855 + 1 * 30.973762 + 1 * 32.065 + 1 * 35.453 + 1 * 39.948 + 1 * 39.0983 + 1 * 40.078 + 1 * 44.955912 + 1 * 47.867 + 1 * 50.9415 + 1 * 51.9961 + 1 * 54.938045 + 1 * 55.845 + 1 * 58.933195 + 1 * 58.6934 + 1 * 63.546 = 3249.3509 g/mol

Mass percent composition	Atomic percent composition

Formula in Hill system is CH₄₅₇AlArBBeCaClCoCrCuFFeHe₁₁₄KLi₇₆MgMnN₃₃NaNeNiO₂₉PSScSiTiV

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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