O1N1He1Na1Fe1C1CU1Ga1F1H1B1SI1Cl1Ne1Ar1CN1CO1Ca1Rb1Mo1U1Mg1Li1Au1Ag1Pt1 molar mass

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of O₁N₁He₁Na₁Fe₁C₁CU₁Ga₁F₁H₁B₁SI₁Cl₁Ne₁Ar₁CN₁CO₁Ca₁Rb₁Mo₁U₁Mg₁Li₁Au₁Ag₁Pt₁ is 1774.7113 g/mol

Convert between O₁N₁He₁Na₁Fe₁C₁CU₁Ga₁F₁H₁B₁SI₁Cl₁Ne₁Ar₁CN₁CO₁Ca₁Rb₁Mo₁U₁Mg₁Li₁Au₁Ag₁Pt₁ weight and moles

Compound	Moles		Weight, g
O₁N₁He₁Na₁Fe₁C₁CU₁Ga₁F₁H₁B₁SI₁Cl₁Ne₁Ar₁CN₁CO₁Ca₁Rb₁Mo₁U₁Mg₁Li₁Au₁Ag₁Pt₁

Elemental composition of O₁N₁He₁Na₁Fe₁C₁CU₁Ga₁F₁H₁B₁SI₁Cl₁Ne₁Ar₁CN₁CO₁Ca₁Rb₁Mo₁U₁Mg₁Li₁Au₁Ag₁Pt₁

Element	Symbol	Atomic weight	Atoms	Mass percent
Oxygen	O	15.9994	2	1.8030
Nitrogen	N	14.0067	2	1.5785
Helium	He	4.002602	1	0.2255
Sodium	Na	22.98976928	1	1.2954
Iron	Fe	55.845	1	3.1467
Carbon	C	12.0107	4	2.7071
Uranium	U	238.02891	2	26.8245
Gallium	Ga	69.723	1	3.9287
Fluorine	F	18.9984032	1	1.0705
Hydrogen	H	1.00794	1	0.0568
Boron	B	10.811	1	0.6092
Sulfur	S	32.065	1	1.8068
Iodine	I	126.90447	1	7.1507
Chlorine	Cl	35.453	1	1.9977
Neon	Ne	20.1797	1	1.1371
Argon	Ar	39.948	1	2.2510
Calcium	Ca	40.078	1	2.2583
Rubidium	Rb	85.4678	1	4.8159
Molybdenum	Mo	95.96	1	5.4071
Magnesium	Mg	24.3050	1	1.3695
Lithium	Li	6.941	1	0.3911
Gold	Au	196.966569	1	11.0985
Silver	Ag	107.8682	1	6.0781
Platinum	Pt	195.084	1	10.9924

Computing molar mass step by step
First, compute the number of each atom in O₁N₁He₁Na₁Fe₁C₁CU₁Ga₁F₁H₁B₁SI₁Cl₁Ne₁Ar₁CN₁CO₁Ca₁Rb₁Mo₁U₁Mg₁Li₁Au₁Ag₁Pt₁: O: 2, N: 2, He: 1, Na: 1, Fe: 1, C: 4, U: 2, Ga: 1, F: 1, H: 1, B: 1, S: 1, I: 1, Cl: 1, Ne: 1, Ar: 1, Ca: 1, Rb: 1, Mo: 1, Mg: 1, Li: 1, Au: 1, Ag: 1, Pt: 1 Then, lookup atomic weights for each element in periodic table: O: 15.9994, N: 14.0067, He: 4.002602, Na: 22.98976928, Fe: 55.845, C: 12.0107, U: 238.02891, Ga: 69.723, F: 18.9984032, H: 1.00794, B: 10.811, S: 32.065, I: 126.90447, Cl: 35.453, Ne: 20.1797, Ar: 39.948, Ca: 40.078, Rb: 85.4678, Mo: 95.96, Mg: 24.305, Li: 6.941, Au: 196.966569, Ag: 107.8682, Pt: 195.084 Now, compute the sum of products of number of atoms to the atomic weight: Molar mass (O₁N₁He₁Na₁Fe₁C₁CU₁Ga₁F₁H₁B₁SI₁Cl₁Ne₁Ar₁CN₁CO₁Ca₁Rb₁Mo₁U₁Mg₁Li₁Au₁Ag₁Pt₁) = ∑ Count_i * Weight_i = Count(O) * Weight(O) + Count(N) * Weight(N) + Count(He) * Weight(He) + Count(Na) * Weight(Na) + Count(Fe) * Weight(Fe) + Count(C) * Weight(C) + Count(U) * Weight(U) + Count(Ga) * Weight(Ga) + Count(F) * Weight(F) + Count(H) * Weight(H) + Count(B) * Weight(B) + Count(S) * Weight(S) + Count(I) * Weight(I) + Count(Cl) * Weight(Cl) + Count(Ne) * Weight(Ne) + Count(Ar) * Weight(Ar) + Count(Ca) * Weight(Ca) + Count(Rb) * Weight(Rb) + Count(Mo) * Weight(Mo) + Count(Mg) * Weight(Mg) + Count(Li) * Weight(Li) + Count(Au) * Weight(Au) + Count(Ag) * Weight(Ag) + Count(Pt) * Weight(Pt) = 2 * 15.9994 + 2 * 14.0067 + 1 * 4.002602 + 1 * 22.98976928 + 1 * 55.845 + 4 * 12.0107 + 2 * 238.02891 + 1 * 69.723 + 1 * 18.9984032 + 1 * 1.00794 + 1 * 10.811 + 1 * 32.065 + 1 * 126.90447 + 1 * 35.453 + 1 * 20.1797 + 1 * 39.948 + 1 * 40.078 + 1 * 85.4678 + 1 * 95.96 + 1 * 24.305 + 1 * 6.941 + 1 * 196.966569 + 1 * 107.8682 + 1 * 195.084 = 1774.7113 g/mol

Mass percent composition	Atomic percent composition

Formula in Hill system is C₄HAgArAuBCaClFFeGaHeILiMgMoN₂NaNeO₂PtRbSU₂

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