H1000He250Li148Be110B96C83N71O63F54Ne50Na45Mg41Al38Si35Rg999 molar mass

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of H₁₀₀₀He₂₅₀Li₁₄₈Be₁₁₀B₉₆C₈₃N₇₁O₆₃F₅₄Ne₅₀Na₄₅Mg₄₁Al₃₈Si₃₅Rg₉₉₉ is 294022.9204 g/mol

Convert between H₁₀₀₀He₂₅₀Li₁₄₈Be₁₁₀B₉₆C₈₃N₇₁O₆₃F₅₄Ne₅₀Na₄₅Mg₄₁Al₃₈Si₃₅Rg₉₉₉ weight and moles

Compound	Moles		Weight, g
H₁₀₀₀He₂₅₀Li₁₄₈Be₁₁₀B₉₆C₈₃N₇₁O₆₃F₅₄Ne₅₀Na₄₅Mg₄₁Al₃₈Si₃₅Rg₉₉₉

Elemental composition of H₁₀₀₀He₂₅₀Li₁₄₈Be₁₁₀B₉₆C₈₃N₇₁O₆₃F₅₄Ne₅₀Na₄₅Mg₄₁Al₃₈Si₃₅Rg₉₉₉

Element	Symbol	Atomic weight	Atoms	Mass percent
Hydrogen	H	1.00794	1000	0.3428
Helium	He	4.002602	250	0.3403
Lithium	Li	6.941	148	0.3494
Beryllium	Be	9.012182	110	0.3372
Boron	B	10.811	96	0.3530
Carbon	C	12.0107	83	0.3391
Nitrogen	N	14.0067	71	0.3382
Oxygen	O	15.9994	63	0.3428
Fluorine	F	18.9984032	54	0.3489
Neon	Ne	20.1797	50	0.3432
Sodium	Na	22.98976928	45	0.3519
Magnesium	Mg	24.3050	41	0.3389
Aluminum	Al	26.9815386	38	0.3487
Silicon	Si	28.0855	35	0.3343
Roentgenium	Rg	280.1645	999	95.1913

Computing molar mass step by step
First, compute the number of each atom in H₁₀₀₀He₂₅₀Li₁₄₈Be₁₁₀B₉₆C₈₃N₇₁O₆₃F₅₄Ne₅₀Na₄₅Mg₄₁Al₃₈Si₃₅Rg₉₉₉: H: 1000, He: 250, Li: 148, Be: 110, B: 96, C: 83, N: 71, O: 63, F: 54, Ne: 50, Na: 45, Mg: 41, Al: 38, Si: 35, Rg: 999 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, Rg: 280.16447 Now, compute the sum of products of number of atoms to the atomic weight: Molar mass (H₁₀₀₀He₂₅₀Li₁₄₈Be₁₁₀B₉₆C₈₃N₇₁O₆₃F₅₄Ne₅₀Na₄₅Mg₄₁Al₃₈Si₃₅Rg₉₉₉) = ∑ 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(Rg) * Weight(Rg) = 1000 * 1.00794 + 250 * 4.002602 + 148 * 6.941 + 110 * 9.012182 + 96 * 10.811 + 83 * 12.0107 + 71 * 14.0067 + 63 * 15.9994 + 54 * 18.9984032 + 50 * 20.1797 + 45 * 22.98976928 + 41 * 24.305 + 38 * 26.9815386 + 35 * 28.0855 + 999 * 280.16447 = 294022.9204 g/mol

Mass percent composition	Atomic percent composition

Formula in Hill system is C₈₃H₁₀₀₀Al₃₈B₉₆Be₁₁₀F₅₄He₂₅₀Li₁₄₈Mg₄₁N₇₁Na₄₅Ne₅₀O₆₃Rg₉₉₉Si₃₅

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

Please let us know how we can improve this web app.

How to cite?

Choose languageDeutschEnglishEspañol Français Italiano Nederlands Polski Português Русский 中文日本語 한국어