H254He64Li380B25O16S8Zn4Xe2LrMdNoFmEsBkCmPuNpPaThAm4 molar mass

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of H₂₅₄He₆₄Li₃₈₀B₂₅O₁₆S₈Zn₄Xe₂LrMdNoFmEsBkCmPuNpPaThAm₄ is 8136.6709 g/mol

Convert between H₂₅₄He₆₄Li₃₈₀B₂₅O₁₆S₈Zn₄Xe₂LrMdNoFmEsBkCmPuNpPaThAm₄ weight and moles

Compound	Moles		Weight, g
H₂₅₄He₆₄Li₃₈₀B₂₅O₁₆S₈Zn₄Xe₂LrMdNoFmEsBkCmPuNpPaThAm₄

Elemental composition of H₂₅₄He₆₄Li₃₈₀B₂₅O₁₆S₈Zn₄Xe₂LrMdNoFmEsBkCmPuNpPaThAm₄

Element	Symbol	Atomic weight	Atoms	Mass percent
Hydrogen	H	1.00794	254	3.1465
Helium	He	4.002602	64	3.1483
Lithium	Li	6.941	380	32.4160
Boron	B	10.811	25	3.3217
Oxygen	O	15.9994	16	3.1461
Sulfur	S	32.065	8	3.1526
Zinc	Zn	65.38	4	3.2141
Xenon	Xe	131.293	2	3.2272
Lawrencium	Lr	262.1096	1	3.2213
Mendelevium	Md	258.098431	1	3.1720
Nobelium	No	259.1010	1	3.1844
Fermium	Fm	257.095105	1	3.1597
Einsteinium	Es	252.08298	1	3.0981
Berkelium	Bk	247.070307	1	3.0365
Curium	Cm	243.061389	1	2.9872
Plutonium	Pu	238.049560	1	2.9256
Neptunium	Np	236.04657	1	2.9010
Protactinium	Pa	231.03588	1	2.8394
Thorium	Th	232.03806	1	2.8518
Americium	Am	241.056829	4	11.8504

Computing molar mass step by step
First, compute the number of each atom in H₂₅₄He₆₄Li₃₈₀B₂₅O₁₆S₈Zn₄Xe₂LrMdNoFmEsBkCmPuNpPaThAm₄: H: 254, He: 64, Li: 380, B: 25, O: 16, S: 8, Zn: 4, Xe: 2, Lr: 1, Md: 1, No: 1, Fm: 1, Es: 1, Bk: 1, Cm: 1, Pu: 1, Np: 1, Pa: 1, Th: 1, Am: 4 Then, lookup atomic weights for each element in periodic table: H: 1.00794, He: 4.002602, Li: 6.941, B: 10.811, O: 15.9994, S: 32.065, Zn: 65.38, Xe: 131.293, Lr: 262.10963, Md: 258.098431, No: 259.10103, Fm: 257.095105, Es: 252.08298, Bk: 247.070307, Cm: 243.0613891, Pu: 238.0495599, Np: 236.04657, Pa: 231.03588, Th: 232.03806, Am: 241.0568291 Now, compute the sum of products of number of atoms to the atomic weight: Molar mass (H₂₅₄He₆₄Li₃₈₀B₂₅O₁₆S₈Zn₄Xe₂LrMdNoFmEsBkCmPuNpPaThAm₄) = ∑ Count_i * Weight_i = Count(H) * Weight(H) + Count(He) * Weight(He) + Count(Li) * Weight(Li) + Count(B) * Weight(B) + Count(O) * Weight(O) + Count(S) * Weight(S) + Count(Zn) * Weight(Zn) + Count(Xe) * Weight(Xe) + Count(Lr) * Weight(Lr) + Count(Md) * Weight(Md) + Count(No) * Weight(No) + Count(Fm) * Weight(Fm) + Count(Es) * Weight(Es) + Count(Bk) * Weight(Bk) + Count(Cm) * Weight(Cm) + Count(Pu) * Weight(Pu) + Count(Np) * Weight(Np) + Count(Pa) * Weight(Pa) + Count(Th) * Weight(Th) + Count(Am) * Weight(Am) = 254 * 1.00794 + 64 * 4.002602 + 380 * 6.941 + 25 * 10.811 + 16 * 15.9994 + 8 * 32.065 + 4 * 65.38 + 2 * 131.293 + 1 * 262.10963 + 1 * 258.098431 + 1 * 259.10103 + 1 * 257.095105 + 1 * 252.08298 + 1 * 247.070307 + 1 * 243.0613891 + 1 * 238.0495599 + 1 * 236.04657 + 1 * 231.03588 + 1 * 232.03806 + 4 * 241.0568291 = 8136.6709 g/mol

Mass percent composition	Atomic percent composition

Formula in Hill system is Am₄B₂₅BkCmEsFmH₂₅₄He₆₄Li₃₈₀LrMdNoNpO₁₆PaPuS₈ThXe₂Zn₄

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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