H23He35Li56Be56B31C99N5O55F89Ne446Na71Mg91Al9912Si354P667S64 molar mass

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of H₂₃He₃₅Li₅₆Be₅₆B₃₁C₉₉N₅O₅₅F₈₉Ne₄₄₆Na₇₁Mg₉₁Al₉₉₁₂Si₃₅₄P₆₆₇S₆₄ is 318160.8222 g/mol

Convert between H₂₃He₃₅Li₅₆Be₅₆B₃₁C₉₉N₅O₅₅F₈₉Ne₄₄₆Na₇₁Mg₉₁Al₉₉₁₂Si₃₅₄P₆₆₇S₆₄ weight and moles

Compound	Moles		Weight, g
H₂₃He₃₅Li₅₆Be₅₆B₃₁C₉₉N₅O₅₅F₈₉Ne₄₄₆Na₇₁Mg₉₁Al₉₉₁₂Si₃₅₄P₆₆₇S₆₄

Elemental composition of H₂₃He₃₅Li₅₆Be₅₆B₃₁C₉₉N₅O₅₅F₈₉Ne₄₄₆Na₇₁Mg₉₁Al₉₉₁₂Si₃₅₄P₆₆₇S₆₄

Element	Symbol	Atomic weight	Atoms	Mass percent
Hydrogen	H	1.00794	23	0.0073
Helium	He	4.002602	35	0.0440
Lithium	Li	6.941	56	0.1222
Beryllium	Be	9.012182	56	0.1586
Boron	B	10.811	31	0.1053
Carbon	C	12.0107	99	0.3737
Nitrogen	N	14.0067	5	0.0220
Oxygen	O	15.9994	55	0.2766
Fluorine	F	18.9984032	89	0.5314
Neon	Ne	20.1797	446	2.8288
Sodium	Na	22.98976928	71	0.5130
Magnesium	Mg	24.3050	91	0.6952
Aluminum	Al	26.9815386	9912	84.0584
Silicon	Si	28.0855	354	3.1249
Phosphorus	P	30.973762	667	6.4934
Sulfur	S	32.065	64	0.6450

Computing molar mass step by step
First, compute the number of each atom in H₂₃He₃₅Li₅₆Be₅₆B₃₁C₉₉N₅O₅₅F₈₉Ne₄₄₆Na₇₁Mg₉₁Al₉₉₁₂Si₃₅₄P₆₆₇S₆₄: H: 23, He: 35, Li: 56, Be: 56, B: 31, C: 99, N: 5, O: 55, F: 89, Ne: 446, Na: 71, Mg: 91, Al: 9912, Si: 354, P: 667, S: 64 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 Now, compute the sum of products of number of atoms to the atomic weight: Molar mass (H₂₃He₃₅Li₅₆Be₅₆B₃₁C₉₉N₅O₅₅F₈₉Ne₄₄₆Na₇₁Mg₉₁Al₉₉₁₂Si₃₅₄P₆₆₇S₆₄) = ∑ 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) = 23 * 1.00794 + 35 * 4.002602 + 56 * 6.941 + 56 * 9.012182 + 31 * 10.811 + 99 * 12.0107 + 5 * 14.0067 + 55 * 15.9994 + 89 * 18.9984032 + 446 * 20.1797 + 71 * 22.98976928 + 91 * 24.305 + 9912 * 26.9815386 + 354 * 28.0855 + 667 * 30.973762 + 64 * 32.065 = 318160.8222 g/mol

Mass percent composition	Atomic percent composition

Formula in Hill system is C₉₉H₂₃Al₉₉₁₂B₃₁Be₅₆F₈₉He₃₅Li₅₆Mg₉₁N₅Na₇₁Ne₄₄₆O₅₅P₆₆₇S₆₄Si₃₅₄

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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