H117He112Li107Be102B97C92N87O82F77Ne72Na67Mg62Al57Si52P47S42 molar mass

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of H₁₁₇He₁₁₂Li₁₀₇Be₁₀₂B₉₇C₉₂N₈₇O₈₂F₇₇Ne₇₂Na₆₇Mg₆₂Al₅₇Si₅₂P₄₇S₄₂ is 18676.2656 g/mol

Convert between H₁₁₇He₁₁₂Li₁₀₇Be₁₀₂B₉₇C₉₂N₈₇O₈₂F₇₇Ne₇₂Na₆₇Mg₆₂Al₅₇Si₅₂P₄₇S₄₂ weight and moles

Compound	Moles		Weight, g
H₁₁₇He₁₁₂Li₁₀₇Be₁₀₂B₉₇C₉₂N₈₇O₈₂F₇₇Ne₇₂Na₆₇Mg₆₂Al₅₇Si₅₂P₄₇S₄₂

Elemental composition of H₁₁₇He₁₁₂Li₁₀₇Be₁₀₂B₉₇C₉₂N₈₇O₈₂F₇₇Ne₇₂Na₆₇Mg₆₂Al₅₇Si₅₂P₄₇S₄₂

Element	Symbol	Atomic weight	Atoms	Mass percent
Hydrogen	H	1.00794	117	0.6314
Helium	He	4.002602	112	2.4003
Lithium	Li	6.941	107	3.9766
Beryllium	Be	9.012182	102	4.9220
Boron	B	10.811	97	5.6150
Carbon	C	12.0107	92	5.9165
Nitrogen	N	14.0067	87	6.5248
Oxygen	O	15.9994	82	7.0247
Fluorine	F	18.9984032	77	7.8328
Neon	Ne	20.1797	72	7.7796
Sodium	Na	22.98976928	67	8.2474
Magnesium	Mg	24.3050	62	8.0686
Aluminum	Al	26.9815386	57	8.2348
Silicon	Si	28.0855	52	7.8198
Phosphorus	P	30.973762	47	7.7947
Sulfur	S	32.065	42	7.2109

Computing molar mass step by step
First, compute the number of each atom in H₁₁₇He₁₁₂Li₁₀₇Be₁₀₂B₉₇C₉₂N₈₇O₈₂F₇₇Ne₇₂Na₆₇Mg₆₂Al₅₇Si₅₂P₄₇S₄₂: H: 117, He: 112, Li: 107, Be: 102, B: 97, C: 92, N: 87, O: 82, F: 77, Ne: 72, Na: 67, Mg: 62, Al: 57, Si: 52, P: 47, S: 42 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 (H₁₁₇He₁₁₂Li₁₀₇Be₁₀₂B₉₇C₉₂N₈₇O₈₂F₇₇Ne₇₂Na₆₇Mg₆₂Al₅₇Si₅₂P₄₇S₄₂) = ∑ 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) = 117 * 1.00794 + 112 * 4.002602 + 107 * 6.941 + 102 * 9.012182 + 97 * 10.811 + 92 * 12.0107 + 87 * 14.0067 + 82 * 15.9994 + 77 * 18.9984032 + 72 * 20.1797 + 67 * 22.98976928 + 62 * 24.305 + 57 * 26.9815386 + 52 * 28.0855 + 47 * 30.973762 + 42 * 32.065 = 18676.2656 g/mol

Mass percent composition	Atomic percent composition

Formula in Hill system is C₉₂H₁₁₇Al₅₇B₉₇Be₁₀₂F₇₇He₁₁₂Li₁₀₇Mg₆₂N₈₇Na₆₇Ne₇₂O₈₂P₄₇S₄₂Si₅₂

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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