He1250H5302Li900Be600Ne424S832C901Pa100Np123U232Bk12OW123Au3 molar mass

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of He₁₂₅₀H₅₃₀₂Li₉₀₀Be₆₀₀Ne₄₂₄S₈₃₂C₉₀₁Pa₁₀₀Np₁₂₃U₂₃₂Bk₁₂OW₁₂₃Au₃ is 201601.5591 g/mol

Convert between He₁₂₅₀H₅₃₀₂Li₉₀₀Be₆₀₀Ne₄₂₄S₈₃₂C₉₀₁Pa₁₀₀Np₁₂₃U₂₃₂Bk₁₂OW₁₂₃Au₃ weight and moles

Compound	Moles		Weight, g
He₁₂₅₀H₅₃₀₂Li₉₀₀Be₆₀₀Ne₄₂₄S₈₃₂C₉₀₁Pa₁₀₀Np₁₂₃U₂₃₂Bk₁₂OW₁₂₃Au₃

Elemental composition of He₁₂₅₀H₅₃₀₂Li₉₀₀Be₆₀₀Ne₄₂₄S₈₃₂C₉₀₁Pa₁₀₀Np₁₂₃U₂₃₂Bk₁₂OW₁₂₃Au₃

Element	Symbol	Atomic weight	Atoms	Mass percent
Helium	He	4.002602	1250	2.4818
Hydrogen	H	1.00794	5302	2.6508
Lithium	Li	6.941	900	3.0986
Beryllium	Be	9.012182	600	2.6822
Neon	Ne	20.1797	424	4.2441
Sulfur	S	32.065	832	13.2331
Carbon	C	12.0107	901	5.3678
Protactinium	Pa	231.03588	100	11.4600
Neptunium	Np	236.04657	123	14.4015
Uranium	U	238.02891	232	27.3920
Berkelium	Bk	247.070307	12	1.4706
Oxygen	O	15.9994	1	0.0079
Tungsten	W	183.84	123	11.2163
Gold	Au	196.966569	3	0.2931

Computing molar mass step by step
First, compute the number of each atom in He₁₂₅₀H₅₃₀₂Li₉₀₀Be₆₀₀Ne₄₂₄S₈₃₂C₉₀₁Pa₁₀₀Np₁₂₃U₂₃₂Bk₁₂OW₁₂₃Au₃: He: 1250, H: 5302, Li: 900, Be: 600, Ne: 424, S: 832, C: 901, Pa: 100, Np: 123, U: 232, Bk: 12, O: 1, W: 123, Au: 3 Then, lookup atomic weights for each element in periodic table: He: 4.002602, H: 1.00794, Li: 6.941, Be: 9.012182, Ne: 20.1797, S: 32.065, C: 12.0107, Pa: 231.03588, Np: 236.04657, U: 238.02891, Bk: 247.070307, O: 15.9994, W: 183.84, Au: 196.966569 Now, compute the sum of products of number of atoms to the atomic weight: Molar mass (He₁₂₅₀H₅₃₀₂Li₉₀₀Be₆₀₀Ne₄₂₄S₈₃₂C₉₀₁Pa₁₀₀Np₁₂₃U₂₃₂Bk₁₂OW₁₂₃Au₃) = ∑ Count_i * Weight_i = Count(He) * Weight(He) + Count(H) * Weight(H) + Count(Li) * Weight(Li) + Count(Be) * Weight(Be) + Count(Ne) * Weight(Ne) + Count(S) * Weight(S) + Count(C) * Weight(C) + Count(Pa) * Weight(Pa) + Count(Np) * Weight(Np) + Count(U) * Weight(U) + Count(Bk) * Weight(Bk) + Count(O) * Weight(O) + Count(W) * Weight(W) + Count(Au) * Weight(Au) = 1250 * 4.002602 + 5302 * 1.00794 + 900 * 6.941 + 600 * 9.012182 + 424 * 20.1797 + 832 * 32.065 + 901 * 12.0107 + 100 * 231.03588 + 123 * 236.04657 + 232 * 238.02891 + 12 * 247.070307 + 1 * 15.9994 + 123 * 183.84 + 3 * 196.966569 = 201601.5591 g/mol

Mass percent composition	Atomic percent composition

Formula in Hill system is C₉₀₁H₅₃₀₂Au₃Be₆₀₀Bk₁₂He₁₂₅₀Li₉₀₀Ne₄₂₄Np₁₂₃OPa₁₀₀S₈₃₂U₂₃₂W₁₂₃

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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