Al31AgAs3BeBCa17C4Cl5Cr5Co2Cu3H3LiMg7Mn2Ni2O141Pt4K4RbSeSi34 molar mass

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of Al₃₁AgAs₃BeBCa₁₇C₄Cl₅Cr₅Co₂Cu₃H₃LiMg₇Mn₂Ni₂O₁₄₁Pt₄K₄RbSeSi₃₄ is 7383.3447 g/mol

Convert between Al₃₁AgAs₃BeBCa₁₇C₄Cl₅Cr₅Co₂Cu₃H₃LiMg₇Mn₂Ni₂O₁₄₁Pt₄K₄RbSeSi₃₄ weight and moles

Compound	Moles		Weight, g
Al₃₁AgAs₃BeBCa₁₇C₄Cl₅Cr₅Co₂Cu₃H₃LiMg₇Mn₂Ni₂O₁₄₁Pt₄K₄RbSeSi₃₄

Elemental composition of Al₃₁AgAs₃BeBCa₁₇C₄Cl₅Cr₅Co₂Cu₃H₃LiMg₇Mn₂Ni₂O₁₄₁Pt₄K₄RbSeSi₃₄

Element	Symbol	Atomic weight	Atoms	Mass percent
Aluminum	Al	26.9815386	31	11.3286
Silver	Ag	107.8682	1	1.4610
Arsenic	As	74.92160	3	3.0442
Beryllium	Be	9.012182	1	0.1221
Boron	B	10.811	1	0.1464
Calcium	Ca	40.078	17	9.2279
Carbon	C	12.0107	4	0.6507
Chlorine	Cl	35.453	5	2.4009
Chromium	Cr	51.9961	5	3.5212
Cobalt	Co	58.933195	2	1.5964
Copper	Cu	63.546	3	2.5820
Hydrogen	H	1.00794	3	0.0410
Lithium	Li	6.941	1	0.0940
Magnesium	Mg	24.3050	7	2.3043
Manganese	Mn	54.938045	2	1.4882
Nickel	Ni	58.6934	2	1.5899
Oxygen	O	15.9994	141	30.5541
Platinum	Pt	195.084	4	10.5689
Potassium	K	39.0983	4	2.1182
Rubidium	Rb	85.4678	1	1.1576
Selenium	Se	78.96	1	1.0694
Silicon	Si	28.0855	34	12.9333

Computing molar mass step by step
First, compute the number of each atom in Al₃₁AgAs₃BeBCa₁₇C₄Cl₅Cr₅Co₂Cu₃H₃LiMg₇Mn₂Ni₂O₁₄₁Pt₄K₄RbSeSi₃₄: Al: 31, Ag: 1, As: 3, Be: 1, B: 1, Ca: 17, C: 4, Cl: 5, Cr: 5, Co: 2, Cu: 3, H: 3, Li: 1, Mg: 7, Mn: 2, Ni: 2, O: 141, Pt: 4, K: 4, Rb: 1, Se: 1, Si: 34 Then, lookup atomic weights for each element in periodic table: Al: 26.9815386, Ag: 107.8682, As: 74.9216, Be: 9.012182, B: 10.811, Ca: 40.078, C: 12.0107, Cl: 35.453, Cr: 51.9961, Co: 58.933195, Cu: 63.546, H: 1.00794, Li: 6.941, Mg: 24.305, Mn: 54.938045, Ni: 58.6934, O: 15.9994, Pt: 195.084, K: 39.0983, Rb: 85.4678, Se: 78.96, Si: 28.0855 Now, compute the sum of products of number of atoms to the atomic weight: Molar mass (Al₃₁AgAs₃BeBCa₁₇C₄Cl₅Cr₅Co₂Cu₃H₃LiMg₇Mn₂Ni₂O₁₄₁Pt₄K₄RbSeSi₃₄) = ∑ Count_i * Weight_i = Count(Al) * Weight(Al) + Count(Ag) * Weight(Ag) + Count(As) * Weight(As) + Count(Be) * Weight(Be) + Count(B) * Weight(B) + Count(Ca) * Weight(Ca) + Count(C) * Weight(C) + Count(Cl) * Weight(Cl) + Count(Cr) * Weight(Cr) + Count(Co) * Weight(Co) + Count(Cu) * Weight(Cu) + Count(H) * Weight(H) + Count(Li) * Weight(Li) + Count(Mg) * Weight(Mg) + Count(Mn) * Weight(Mn) + Count(Ni) * Weight(Ni) + Count(O) * Weight(O) + Count(Pt) * Weight(Pt) + Count(K) * Weight(K) + Count(Rb) * Weight(Rb) + Count(Se) * Weight(Se) + Count(Si) * Weight(Si) = 31 * 26.9815386 + 1 * 107.8682 + 3 * 74.9216 + 1 * 9.012182 + 1 * 10.811 + 17 * 40.078 + 4 * 12.0107 + 5 * 35.453 + 5 * 51.9961 + 2 * 58.933195 + 3 * 63.546 + 3 * 1.00794 + 1 * 6.941 + 7 * 24.305 + 2 * 54.938045 + 2 * 58.6934 + 141 * 15.9994 + 4 * 195.084 + 4 * 39.0983 + 1 * 85.4678 + 1 * 78.96 + 34 * 28.0855 = 7383.3447 g/mol

Mass percent composition	Atomic percent composition

Formula in Hill system is C₄H₃AgAl₃₁As₃BBeCa₁₇Cl₅Co₂Cr₅Cu₃K₄LiMg₇Mn₂Ni₂O₁₄₁Pt₄RbSeSi₃₄

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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