ArH13He10K3Li2Mn7Ne5O2P8Pt7S3SbSe2SnU9NbMoOsV2Cr2Y7Ta4Hf9As8 molar mass

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of ArH₁₃He₁₀K₃Li₂Mn₇Ne₅O₂P₈Pt₇S₃SbSe₂SnU₉NbMoOsV₂Cr₂Y₇Ta₄Hf₉As₈ is 9128.8279 g/mol

Convert between ArH₁₃He₁₀K₃Li₂Mn₇Ne₅O₂P₈Pt₇S₃SbSe₂SnU₉NbMoOsV₂Cr₂Y₇Ta₄Hf₉As₈ weight and moles

Compound	Moles		Weight, g
ArH₁₃He₁₀K₃Li₂Mn₇Ne₅O₂P₈Pt₇S₃SbSe₂SnU₉NbMoOsV₂Cr₂Y₇Ta₄Hf₉As₈

Elemental composition of ArH₁₃He₁₀K₃Li₂Mn₇Ne₅O₂P₈Pt₇S₃SbSe₂SnU₉NbMoOsV₂Cr₂Y₇Ta₄Hf₉As₈

Element	Symbol	Atomic weight	Atoms	Mass percent
Argon	Ar	39.948	1	0.4376
Hydrogen	H	1.00794	13	0.1435
Helium	He	4.002602	10	0.4385
Potassium	K	39.0983	3	1.2849
Lithium	Li	6.941	2	0.1521
Manganese	Mn	54.938045	7	4.2127
Neon	Ne	20.1797	5	1.1053
Oxygen	O	15.9994	2	0.3505
Phosphorus	P	30.973762	8	2.7144
Platinum	Pt	195.084	7	14.9591
Sulfur	S	32.065	3	1.0537
Antimony	Sb	121.760	1	1.3338
Selenium	Se	78.96	2	1.7299
Tin	Sn	118.710	1	1.3004
Uranium	U	238.02891	9	23.4670
Niobium	Nb	92.90638	1	1.0177
Molybdenum	Mo	95.96	1	1.0512
Osmium	Os	190.23	1	2.0838
Vanadium	V	50.9415	2	1.1161
Chromium	Cr	51.9961	2	1.1392
Yttrium	Y	88.90585	7	6.8173
Tantalum	Ta	180.94788	4	7.9286
Hafnium	Hf	178.49	9	17.5971
Arsenic	As	74.92160	8	6.5657

Computing molar mass step by step
First, compute the number of each atom in ArH₁₃He₁₀K₃Li₂Mn₇Ne₅O₂P₈Pt₇S₃SbSe₂SnU₉NbMoOsV₂Cr₂Y₇Ta₄Hf₉As₈: Ar: 1, H: 13, He: 10, K: 3, Li: 2, Mn: 7, Ne: 5, O: 2, P: 8, Pt: 7, S: 3, Sb: 1, Se: 2, Sn: 1, U: 9, Nb: 1, Mo: 1, Os: 1, V: 2, Cr: 2, Y: 7, Ta: 4, Hf: 9, As: 8 Then, lookup atomic weights for each element in periodic table: Ar: 39.948, H: 1.00794, He: 4.002602, K: 39.0983, Li: 6.941, Mn: 54.938045, Ne: 20.1797, O: 15.9994, P: 30.973762, Pt: 195.084, S: 32.065, Sb: 121.76, Se: 78.96, Sn: 118.71, U: 238.02891, Nb: 92.90638, Mo: 95.96, Os: 190.23, V: 50.9415, Cr: 51.9961, Y: 88.90585, Ta: 180.94788, Hf: 178.49, As: 74.9216 Now, compute the sum of products of number of atoms to the atomic weight: Molar mass (ArH₁₃He₁₀K₃Li₂Mn₇Ne₅O₂P₈Pt₇S₃SbSe₂SnU₉NbMoOsV₂Cr₂Y₇Ta₄Hf₉As₈) = ∑ Count_i * Weight_i = Count(Ar) * Weight(Ar) + Count(H) * Weight(H) + Count(He) * Weight(He) + Count(K) * Weight(K) + Count(Li) * Weight(Li) + Count(Mn) * Weight(Mn) + Count(Ne) * Weight(Ne) + Count(O) * Weight(O) + Count(P) * Weight(P) + Count(Pt) * Weight(Pt) + Count(S) * Weight(S) + Count(Sb) * Weight(Sb) + Count(Se) * Weight(Se) + Count(Sn) * Weight(Sn) + Count(U) * Weight(U) + Count(Nb) * Weight(Nb) + Count(Mo) * Weight(Mo) + Count(Os) * Weight(Os) + Count(V) * Weight(V) + Count(Cr) * Weight(Cr) + Count(Y) * Weight(Y) + Count(Ta) * Weight(Ta) + Count(Hf) * Weight(Hf) + Count(As) * Weight(As) = 1 * 39.948 + 13 * 1.00794 + 10 * 4.002602 + 3 * 39.0983 + 2 * 6.941 + 7 * 54.938045 + 5 * 20.1797 + 2 * 15.9994 + 8 * 30.973762 + 7 * 195.084 + 3 * 32.065 + 1 * 121.76 + 2 * 78.96 + 1 * 118.71 + 9 * 238.02891 + 1 * 92.90638 + 1 * 95.96 + 1 * 190.23 + 2 * 50.9415 + 2 * 51.9961 + 7 * 88.90585 + 4 * 180.94788 + 9 * 178.49 + 8 * 74.9216 = 9128.8279 g/mol

Mass percent composition	Atomic percent composition

Formula in Hill system is ArAs₈Cr₂H₁₃He₁₀Hf₉K₃Li₂Mn₇MoNbNe₅O₂OsP₈Pt₇S₃SbSe₂SnTa₄U₉V₂Y₇

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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