H2ClP7Si4Na3NO3AtU8Br9B2Al4Fe15Cu21Ni3Co12Au9Ag14Hg34Pb12S4 molar mass

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of H₂ClP₇Si₄Na₃NO₃AtU₈Br₉B₂Al₄Fe₁₅Cu₂₁Ni₃Co₁₂Au₉Ag₁₄Hg₃₄Pb₁₂S₄ is 19233.4975 g/mol

Convert between H₂ClP₇Si₄Na₃NO₃AtU₈Br₉B₂Al₄Fe₁₅Cu₂₁Ni₃Co₁₂Au₉Ag₁₄Hg₃₄Pb₁₂S₄ weight and moles

Compound	Moles		Weight, g
H₂ClP₇Si₄Na₃NO₃AtU₈Br₉B₂Al₄Fe₁₅Cu₂₁Ni₃Co₁₂Au₉Ag₁₄Hg₃₄Pb₁₂S₄

Elemental composition of H₂ClP₇Si₄Na₃NO₃AtU₈Br₉B₂Al₄Fe₁₅Cu₂₁Ni₃Co₁₂Au₉Ag₁₄Hg₃₄Pb₁₂S₄

Element	Symbol	Atomic weight	Atoms	Mass percent
Hydrogen	H	1.00794	2	0.0105
Chlorine	Cl	35.453	1	0.1843
Phosphorus	P	30.973762	7	1.1273
Silicon	Si	28.0855	4	0.5841
Sodium	Na	22.98976928	3	0.3586
Nitrogen	N	14.0067	1	0.0728
Oxygen	O	15.9994	3	0.2496
Astatine	At	209.987148	1	1.0918
Uranium	U	238.02891	8	9.9006
Bromine	Br	79.904	9	3.7390
Boron	B	10.811	2	0.1124
Aluminum	Al	26.9815386	4	0.5611
Iron	Fe	55.845	15	4.3553
Copper	Cu	63.546	21	6.9382
Nickel	Ni	58.6934	3	0.9155
Cobalt	Co	58.933195	12	3.6769
Gold	Au	196.966569	9	9.2167
Silver	Ag	107.8682	14	7.8517
Mercury	Hg	200.59	34	35.4593
Lead	Pb	207.2	12	12.9274
Sulfur	S	32.065	4	0.6669

Computing molar mass step by step
First, compute the number of each atom in H₂ClP₇Si₄Na₃NO₃AtU₈Br₉B₂Al₄Fe₁₅Cu₂₁Ni₃Co₁₂Au₉Ag₁₄Hg₃₄Pb₁₂S₄: H: 2, Cl: 1, P: 7, Si: 4, Na: 3, N: 1, O: 3, At: 1, U: 8, Br: 9, B: 2, Al: 4, Fe: 15, Cu: 21, Ni: 3, Co: 12, Au: 9, Ag: 14, Hg: 34, Pb: 12, S: 4 Then, lookup atomic weights for each element in periodic table: H: 1.00794, Cl: 35.453, P: 30.973762, Si: 28.0855, Na: 22.98976928, N: 14.0067, O: 15.9994, At: 209.987148, U: 238.02891, Br: 79.904, B: 10.811, Al: 26.9815386, Fe: 55.845, Cu: 63.546, Ni: 58.6934, Co: 58.933195, Au: 196.966569, Ag: 107.8682, Hg: 200.59, Pb: 207.2, S: 32.065 Now, compute the sum of products of number of atoms to the atomic weight: Molar mass (H₂ClP₇Si₄Na₃NO₃AtU₈Br₉B₂Al₄Fe₁₅Cu₂₁Ni₃Co₁₂Au₉Ag₁₄Hg₃₄Pb₁₂S₄) = ∑ Count_i * Weight_i = Count(H) * Weight(H) + Count(Cl) * Weight(Cl) + Count(P) * Weight(P) + Count(Si) * Weight(Si) + Count(Na) * Weight(Na) + Count(N) * Weight(N) + Count(O) * Weight(O) + Count(At) * Weight(At) + Count(U) * Weight(U) + Count(Br) * Weight(Br) + Count(B) * Weight(B) + Count(Al) * Weight(Al) + Count(Fe) * Weight(Fe) + Count(Cu) * Weight(Cu) + Count(Ni) * Weight(Ni) + Count(Co) * Weight(Co) + Count(Au) * Weight(Au) + Count(Ag) * Weight(Ag) + Count(Hg) * Weight(Hg) + Count(Pb) * Weight(Pb) + Count(S) * Weight(S) = 2 * 1.00794 + 1 * 35.453 + 7 * 30.973762 + 4 * 28.0855 + 3 * 22.98976928 + 1 * 14.0067 + 3 * 15.9994 + 1 * 209.987148 + 8 * 238.02891 + 9 * 79.904 + 2 * 10.811 + 4 * 26.9815386 + 15 * 55.845 + 21 * 63.546 + 3 * 58.6934 + 12 * 58.933195 + 9 * 196.966569 + 14 * 107.8682 + 34 * 200.59 + 12 * 207.2 + 4 * 32.065 = 19233.4975 g/mol

Mass percent composition	Atomic percent composition

Formula in Hill system is Ag₁₄Al₄AtAu₉B₂Br₉ClCo₁₂Cu₂₁Fe₁₅H₂Hg₃₄NNa₃Ni₃O₃P₇Pb₁₂S₄Si₄U₈

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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