C783H103O48N399P293S283He939Fe849Cu8390K90Kr393Ar4993Na499Cl molar mass

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of C₇₈₃H₁₀₃O₄₈N₃₉₉P₂₉₃S₂₈₃He₉₃₉Fe₈₄₉Cu₈₃₉₀K₉₀Kr₃₉₃Ar₄₉₉₃Na₄₉₉Cl is 865755.5088 g/mol

Convert between C₇₈₃H₁₀₃O₄₈N₃₉₉P₂₉₃S₂₈₃He₉₃₉Fe₈₄₉Cu₈₃₉₀K₉₀Kr₃₉₃Ar₄₉₉₃Na₄₉₉Cl weight and moles

Compound	Moles		Weight, g
C₇₈₃H₁₀₃O₄₈N₃₉₉P₂₉₃S₂₈₃He₉₃₉Fe₈₄₉Cu₈₃₉₀K₉₀Kr₃₉₃Ar₄₉₉₃Na₄₉₉Cl

Elemental composition of C₇₈₃H₁₀₃O₄₈N₃₉₉P₂₉₃S₂₈₃He₉₃₉Fe₈₄₉Cu₈₃₉₀K₉₀Kr₃₉₃Ar₄₉₉₃Na₄₉₉Cl

Element	Symbol	Atomic weight	Atoms	Mass percent
Carbon	C	12.0107	783	1.0863
Hydrogen	H	1.00794	103	0.0120
Oxygen	O	15.9994	48	0.0887
Nitrogen	N	14.0067	399	0.6455
Phosphorus	P	30.973762	293	1.0483
Sulfur	S	32.065	283	1.0481
Helium	He	4.002602	939	0.4341
Iron	Fe	55.845	849	5.4764
Copper	Cu	63.546	8390	61.5822
Potassium	K	39.0983	90	0.4064
Krypton	Kr	83.798	393	3.8039
Argon	Ar	39.948	4993	23.0389
Sodium	Na	22.98976928	499	1.3251
Chlorine	Cl	35.453	1	0.0041

Computing molar mass step by step
First, compute the number of each atom in C₇₈₃H₁₀₃O₄₈N₃₉₉P₂₉₃S₂₈₃He₉₃₉Fe₈₄₉Cu₈₃₉₀K₉₀Kr₃₉₃Ar₄₉₉₃Na₄₉₉Cl: C: 783, H: 103, O: 48, N: 399, P: 293, S: 283, He: 939, Fe: 849, Cu: 8390, K: 90, Kr: 393, Ar: 4993, Na: 499, Cl: 1 Then, lookup atomic weights for each element in periodic table: C: 12.0107, H: 1.00794, O: 15.9994, N: 14.0067, P: 30.973762, S: 32.065, He: 4.002602, Fe: 55.845, Cu: 63.546, K: 39.0983, Kr: 83.798, Ar: 39.948, Na: 22.98976928, Cl: 35.453 Now, compute the sum of products of number of atoms to the atomic weight: Molar mass (C₇₈₃H₁₀₃O₄₈N₃₉₉P₂₉₃S₂₈₃He₉₃₉Fe₈₄₉Cu₈₃₉₀K₉₀Kr₃₉₃Ar₄₉₉₃Na₄₉₉Cl) = ∑ Count_i * Weight_i = Count(C) * Weight(C) + Count(H) * Weight(H) + Count(O) * Weight(O) + Count(N) * Weight(N) + Count(P) * Weight(P) + Count(S) * Weight(S) + Count(He) * Weight(He) + Count(Fe) * Weight(Fe) + Count(Cu) * Weight(Cu) + Count(K) * Weight(K) + Count(Kr) * Weight(Kr) + Count(Ar) * Weight(Ar) + Count(Na) * Weight(Na) + Count(Cl) * Weight(Cl) = 783 * 12.0107 + 103 * 1.00794 + 48 * 15.9994 + 399 * 14.0067 + 293 * 30.973762 + 283 * 32.065 + 939 * 4.002602 + 849 * 55.845 + 8390 * 63.546 + 90 * 39.0983 + 393 * 83.798 + 4993 * 39.948 + 499 * 22.98976928 + 1 * 35.453 = 865755.5088 g/mol

Mass percent composition	Atomic percent composition

Formula in Hill system is C₇₈₃H₁₀₃Ar₄₉₉₃ClCu₈₃₉₀Fe₈₄₉He₉₃₉K₉₀Kr₃₉₃N₃₉₉Na₄₉₉O₄₈P₂₉₃S₂₈₃

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, 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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