Os76Ir77Pt78Au79Hg80Tl81Pb82Bi83Po84At85Rn86Fr87Ra88Ac89Th90 molar mass

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of Os₇₆Ir₇₇Pt₇₈Au₇₉Hg₈₀Tl₈₁Pb₈₂Bi₈₃Po₈₄At₈₅Rn₈₆Fr₈₇Ra₈₈Ac₈₉Th₉₀ is 260903.5923 g/mol

Convert between Os₇₆Ir₇₇Pt₇₈Au₇₉Hg₈₀Tl₈₁Pb₈₂Bi₈₃Po₈₄At₈₅Rn₈₆Fr₈₇Ra₈₈Ac₈₉Th₉₀ weight and moles

Compound	Moles		Weight, g
Os₇₆Ir₇₇Pt₇₈Au₇₉Hg₈₀Tl₈₁Pb₈₂Bi₈₃Po₈₄At₈₅Rn₈₆Fr₈₇Ra₈₈Ac₈₉Th₉₀

Elemental composition of Os₇₆Ir₇₇Pt₇₈Au₇₉Hg₈₀Tl₈₁Pb₈₂Bi₈₃Po₈₄At₈₅Rn₈₆Fr₈₇Ra₈₈Ac₈₉Th₉₀

Element	Symbol	Atomic weight	Atoms	Mass percent
Osmium	Os	190.23	76	5.5413
Iridium	Ir	192.217	77	5.6729
Platinum	Pt	195.084	78	5.8323
Gold	Au	196.966569	79	5.9640
Mercury	Hg	200.59	80	6.1506
Thallium	Tl	204.3833	81	6.3453
Lead	Pb	207.2	82	6.5121
Bismuth	Bi	208.98040	83	6.6482
Polonium	Po	208.982430	84	6.7284
Astatine	At	209.987148	85	6.8412
Radon	Rn	210.990601	86	6.9547
Francium	Fr	223.019736	87	7.4367
Radium	Ra	226.025410	88	7.6236
Actinium	Ac	227.027752	89	7.7444
Thorium	Th	232.03806	90	8.0043

Computing molar mass step by step
First, compute the number of each atom in Os₇₆Ir₇₇Pt₇₈Au₇₉Hg₈₀Tl₈₁Pb₈₂Bi₈₃Po₈₄At₈₅Rn₈₆Fr₈₇Ra₈₈Ac₈₉Th₉₀: Os: 76, Ir: 77, Pt: 78, Au: 79, Hg: 80, Tl: 81, Pb: 82, Bi: 83, Po: 84, At: 85, Rn: 86, Fr: 87, Ra: 88, Ac: 89, Th: 90 Then, lookup atomic weights for each element in periodic table: Os: 190.23, Ir: 192.217, Pt: 195.084, Au: 196.966569, Hg: 200.59, Tl: 204.3833, Pb: 207.2, Bi: 208.9804, Po: 208.9824304, At: 209.987148, Rn: 210.990601, Fr: 223.0197359, Ra: 226.0254098, Ac: 227.0277521, Th: 232.03806 Now, compute the sum of products of number of atoms to the atomic weight: Molar mass (Os₇₆Ir₇₇Pt₇₈Au₇₉Hg₈₀Tl₈₁Pb₈₂Bi₈₃Po₈₄At₈₅Rn₈₆Fr₈₇Ra₈₈Ac₈₉Th₉₀) = ∑ Count_i * Weight_i = Count(Os) * Weight(Os) + Count(Ir) * Weight(Ir) + Count(Pt) * Weight(Pt) + Count(Au) * Weight(Au) + Count(Hg) * Weight(Hg) + Count(Tl) * Weight(Tl) + Count(Pb) * Weight(Pb) + Count(Bi) * Weight(Bi) + Count(Po) * Weight(Po) + Count(At) * Weight(At) + Count(Rn) * Weight(Rn) + Count(Fr) * Weight(Fr) + Count(Ra) * Weight(Ra) + Count(Ac) * Weight(Ac) + Count(Th) * Weight(Th) = 76 * 190.23 + 77 * 192.217 + 78 * 195.084 + 79 * 196.966569 + 80 * 200.59 + 81 * 204.3833 + 82 * 207.2 + 83 * 208.9804 + 84 * 208.9824304 + 85 * 209.987148 + 86 * 210.990601 + 87 * 223.0197359 + 88 * 226.0254098 + 89 * 227.0277521 + 90 * 232.03806 = 260903.5923 g/mol

Mass percent composition	Atomic percent composition

Formula in Hill system is Ac₈₉At₈₅Au₇₉Bi₈₃Fr₈₇Hg₈₀Ir₇₇Os₇₆Pb₈₂Po₈₄Pt₇₈Ra₈₈Rn₈₆Th₉₀Tl₈₁

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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