H2O3HePSi3BY4Os2UN3Li2ClS8W2SeKr3Tm2Fm4I2Al molar mass

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of H₂O₃HePSi₃BY₄Os₂UN₃Li₂ClS₈W₂SeKr₃Tm₂Fm₄I₂Al is 3847.1187 g/mol

Convert between H₂O₃HePSi₃BY₄Os₂UN₃Li₂ClS₈W₂SeKr₃Tm₂Fm₄I₂Al weight and moles

Compound	Moles		Weight, g
H₂O₃HePSi₃BY₄Os₂UN₃Li₂ClS₈W₂SeKr₃Tm₂Fm₄I₂Al

Elemental composition of H₂O₃HePSi₃BY₄Os₂UN₃Li₂ClS₈W₂SeKr₃Tm₂Fm₄I₂Al

Element	Symbol	Atomic weight	Atoms	Mass percent
Hydrogen	H	1.00794	2	0.0524
Oxygen	O	15.9994	3	1.2476
Helium	He	4.002602	1	0.1040
Phosphorus	P	30.973762	1	0.8051
Silicon	Si	28.0855	3	2.1901
Boron	B	10.811	1	0.2810
Yttrium	Y	88.90585	4	9.2439
Osmium	Os	190.23	2	9.8895
Uranium	U	238.02891	1	6.1872
Nitrogen	N	14.0067	3	1.0922
Lithium	Li	6.941	2	0.3608
Chlorine	Cl	35.453	1	0.9215
Sulfur	S	32.065	8	6.6678
Tungsten	W	183.84	2	9.5573
Selenium	Se	78.96	1	2.0524
Krypton	Kr	83.798	3	6.5346
Thulium	Tm	168.93421	2	8.7824
Fermium	Fm	257.095105	4	26.7312
Iodine	I	126.90447	2	6.5974
Aluminum	Al	26.9815386	1	0.7013

Computing molar mass step by step
First, compute the number of each atom in H₂O₃HePSi₃BY₄Os₂UN₃Li₂ClS₈W₂SeKr₃Tm₂Fm₄I₂Al: H: 2, O: 3, He: 1, P: 1, Si: 3, B: 1, Y: 4, Os: 2, U: 1, N: 3, Li: 2, Cl: 1, S: 8, W: 2, Se: 1, Kr: 3, Tm: 2, Fm: 4, I: 2, Al: 1 Then, lookup atomic weights for each element in periodic table: H: 1.00794, O: 15.9994, He: 4.002602, P: 30.973762, Si: 28.0855, B: 10.811, Y: 88.90585, Os: 190.23, U: 238.02891, N: 14.0067, Li: 6.941, Cl: 35.453, S: 32.065, W: 183.84, Se: 78.96, Kr: 83.798, Tm: 168.93421, Fm: 257.095105, I: 126.90447, Al: 26.9815386 Now, compute the sum of products of number of atoms to the atomic weight: Molar mass (H₂O₃HePSi₃BY₄Os₂UN₃Li₂ClS₈W₂SeKr₃Tm₂Fm₄I₂Al) = ∑ Count_i * Weight_i = Count(H) * Weight(H) + Count(O) * Weight(O) + Count(He) * Weight(He) + Count(P) * Weight(P) + Count(Si) * Weight(Si) + Count(B) * Weight(B) + Count(Y) * Weight(Y) + Count(Os) * Weight(Os) + Count(U) * Weight(U) + Count(N) * Weight(N) + Count(Li) * Weight(Li) + Count(Cl) * Weight(Cl) + Count(S) * Weight(S) + Count(W) * Weight(W) + Count(Se) * Weight(Se) + Count(Kr) * Weight(Kr) + Count(Tm) * Weight(Tm) + Count(Fm) * Weight(Fm) + Count(I) * Weight(I) + Count(Al) * Weight(Al) = 2 * 1.00794 + 3 * 15.9994 + 1 * 4.002602 + 1 * 30.973762 + 3 * 28.0855 + 1 * 10.811 + 4 * 88.90585 + 2 * 190.23 + 1 * 238.02891 + 3 * 14.0067 + 2 * 6.941 + 1 * 35.453 + 8 * 32.065 + 2 * 183.84 + 1 * 78.96 + 3 * 83.798 + 2 * 168.93421 + 4 * 257.095105 + 2 * 126.90447 + 1 * 26.9815386 = 3847.1187 g/mol

Mass percent composition	Atomic percent composition

Formula in Hill system is AlBClFm₄H₂HeI₂Kr₃Li₂N₃O₃Os₂PS₈SeSi₃Tm₂UW₂Y₄

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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