H555He6Li755Be88B99C100N67O34F567Ne9Na77Mg11Al68SiPSClArKCa molar mass

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of H₅₅₅He₆Li₇₅₅Be₈₈B₉₉C₁₀₀N₆₇O₃₄F₅₆₇Ne₉Na₇₇Mg₁₁Al₆₈SiPSClArKCa is 25442.4622 g/mol

Convert between H₅₅₅He₆Li₇₅₅Be₈₈B₉₉C₁₀₀N₆₇O₃₄F₅₆₇Ne₉Na₇₇Mg₁₁Al₆₈SiPSClArKCa weight and moles

Compound	Moles		Weight, g
H₅₅₅He₆Li₇₅₅Be₈₈B₉₉C₁₀₀N₆₇O₃₄F₅₆₇Ne₉Na₇₇Mg₁₁Al₆₈SiPSClArKCa

Elemental composition of H₅₅₅He₆Li₇₅₅Be₈₈B₉₉C₁₀₀N₆₇O₃₄F₅₆₇Ne₉Na₇₇Mg₁₁Al₆₈SiPSClArKCa

Element	Symbol	Atomic weight	Atoms	Mass percent
Hydrogen	H	1.00794	555	2.1987
Helium	He	4.002602	6	0.0944
Lithium	Li	6.941	755	20.5973
Beryllium	Be	9.012182	88	3.1171
Boron	B	10.811	99	4.2067
Carbon	C	12.0107	100	4.7207
Nitrogen	N	14.0067	67	3.6885
Oxygen	O	15.9994	34	2.1381
Fluorine	F	18.9984032	567	42.3390
Neon	Ne	20.1797	9	0.7138
Sodium	Na	22.98976928	77	6.9577
Magnesium	Mg	24.3050	11	1.0508
Aluminum	Al	26.9815386	68	7.2113
Silicon	Si	28.0855	1	0.1104
Phosphorus	P	30.973762	1	0.1217
Sulfur	S	32.065	1	0.1260
Chlorine	Cl	35.453	1	0.1393
Argon	Ar	39.948	1	0.1570
Potassium	K	39.0983	1	0.1537
Calcium	Ca	40.078	1	0.1575

Computing molar mass step by step
First, compute the number of each atom in H₅₅₅He₆Li₇₅₅Be₈₈B₉₉C₁₀₀N₆₇O₃₄F₅₆₇Ne₉Na₇₇Mg₁₁Al₆₈SiPSClArKCa: H: 555, He: 6, Li: 755, Be: 88, B: 99, C: 100, N: 67, O: 34, F: 567, Ne: 9, Na: 77, Mg: 11, Al: 68, Si: 1, P: 1, S: 1, Cl: 1, Ar: 1, K: 1, Ca: 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 Now, compute the sum of products of number of atoms to the atomic weight: Molar mass (H₅₅₅He₆Li₇₅₅Be₈₈B₉₉C₁₀₀N₆₇O₃₄F₅₆₇Ne₉Na₇₇Mg₁₁Al₆₈SiPSClArKCa) = ∑ 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) = 555 * 1.00794 + 6 * 4.002602 + 755 * 6.941 + 88 * 9.012182 + 99 * 10.811 + 100 * 12.0107 + 67 * 14.0067 + 34 * 15.9994 + 567 * 18.9984032 + 9 * 20.1797 + 77 * 22.98976928 + 11 * 24.305 + 68 * 26.9815386 + 1 * 28.0855 + 1 * 30.973762 + 1 * 32.065 + 1 * 35.453 + 1 * 39.948 + 1 * 39.0983 + 1 * 40.078 = 25442.4622 g/mol

Mass percent composition	Atomic percent composition

Formula in Hill system is C₁₀₀H₅₅₅Al₆₈ArB₉₉Be₈₈CaClF₅₆₇He₆KLi₇₅₅Mg₁₁N₆₇Na₇₇Ne₉O₃₄PSSi

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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