H78FONpHe12Ne123Ar198KrXe231Rn233Au133Zn123Cd123Hg133Cn233Cu molar mass

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of H₇₈FONpHe₁₂Ne₁₂₃Ar₁₉₈KrXe₂₃₁Rn₂₃₃Au₁₃₃Zn₁₂₃Cd₁₂₃Hg₁₃₃Cn₂₃₃Cu is 231615.2234 g/mol

Convert between H₇₈FONpHe₁₂Ne₁₂₃Ar₁₉₈KrXe₂₃₁Rn₂₃₃Au₁₃₃Zn₁₂₃Cd₁₂₃Hg₁₃₃Cn₂₃₃Cu weight and moles

Compound	Moles		Weight, g
H₇₈FONpHe₁₂Ne₁₂₃Ar₁₉₈KrXe₂₃₁Rn₂₃₃Au₁₃₃Zn₁₂₃Cd₁₂₃Hg₁₃₃Cn₂₃₃Cu

Elemental composition of H₇₈FONpHe₁₂Ne₁₂₃Ar₁₉₈KrXe₂₃₁Rn₂₃₃Au₁₃₃Zn₁₂₃Cd₁₂₃Hg₁₃₃Cn₂₃₃Cu

Element	Symbol	Atomic weight	Atoms	Mass percent
Hydrogen	H	1.00794	78	0.0339
Fluorine	F	18.9984032	1	0.0082
Oxygen	O	15.9994	1	0.0069
Neptunium	Np	236.04657	1	0.1019
Helium	He	4.002602	12	0.0207
Neon	Ne	20.1797	123	1.0716
Argon	Ar	39.948	198	3.4150
Krypton	Kr	83.798	1	0.0362
Xenon	Xe	131.293	231	13.0944
Radon	Rn	210.990601	233	21.2252
Gold	Au	196.966569	133	11.3104
Zinc	Zn	65.38	123	3.4720
Cadmium	Cd	112.411	123	5.9696
Mercury	Hg	200.59	133	11.5184
Copernicium	Cn	285.1741	233	28.6879
Copper	Cu	63.546	1	0.0274

Computing molar mass step by step
First, compute the number of each atom in H₇₈FONpHe₁₂Ne₁₂₃Ar₁₉₈KrXe₂₃₁Rn₂₃₃Au₁₃₃Zn₁₂₃Cd₁₂₃Hg₁₃₃Cn₂₃₃Cu: H: 78, F: 1, O: 1, Np: 1, He: 12, Ne: 123, Ar: 198, Kr: 1, Xe: 231, Rn: 233, Au: 133, Zn: 123, Cd: 123, Hg: 133, Cn: 233, Cu: 1 Then, lookup atomic weights for each element in periodic table: H: 1.00794, F: 18.9984032, O: 15.9994, Np: 236.04657, He: 4.002602, Ne: 20.1797, Ar: 39.948, Kr: 83.798, Xe: 131.293, Rn: 210.990601, Au: 196.966569, Zn: 65.38, Cd: 112.411, Hg: 200.59, Cn: 285.17411, Cu: 63.546 Now, compute the sum of products of number of atoms to the atomic weight: Molar mass (H₇₈FONpHe₁₂Ne₁₂₃Ar₁₉₈KrXe₂₃₁Rn₂₃₃Au₁₃₃Zn₁₂₃Cd₁₂₃Hg₁₃₃Cn₂₃₃Cu) = ∑ Count_i * Weight_i = Count(H) * Weight(H) + Count(F) * Weight(F) + Count(O) * Weight(O) + Count(Np) * Weight(Np) + Count(He) * Weight(He) + Count(Ne) * Weight(Ne) + Count(Ar) * Weight(Ar) + Count(Kr) * Weight(Kr) + Count(Xe) * Weight(Xe) + Count(Rn) * Weight(Rn) + Count(Au) * Weight(Au) + Count(Zn) * Weight(Zn) + Count(Cd) * Weight(Cd) + Count(Hg) * Weight(Hg) + Count(Cn) * Weight(Cn) + Count(Cu) * Weight(Cu) = 78 * 1.00794 + 1 * 18.9984032 + 1 * 15.9994 + 1 * 236.04657 + 12 * 4.002602 + 123 * 20.1797 + 198 * 39.948 + 1 * 83.798 + 231 * 131.293 + 233 * 210.990601 + 133 * 196.966569 + 123 * 65.38 + 123 * 112.411 + 133 * 200.59 + 233 * 285.17411 + 1 * 63.546 = 231615.2234 g/mol

Mass percent composition	Atomic percent composition

Formula in Hill system is Ar₁₉₈Au₁₃₃Cd₁₂₃Cn₂₃₃CuFH₇₈He₁₂Hg₁₃₃KrNe₁₂₃NpORn₂₃₃Xe₂₃₁Zn₁₂₃

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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