C72H215O9Cd7Hg88Ar90As25Sb10U99At91Th91Tm100Xe99 molar mass

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of C₇₂H₂₁₅O₉Cd₇Hg₈₈Ar₉₀As₂₅Sb₁₀U₉₉At₉₁Th₉₁Tm₁₀₀Xe₉₉ is 120030.8131 g/mol

Convert between C₇₂H₂₁₅O₉Cd₇Hg₈₈Ar₉₀As₂₅Sb₁₀U₉₉At₉₁Th₉₁Tm₁₀₀Xe₉₉ weight and moles

Compound	Moles		Weight, g
C₇₂H₂₁₅O₉Cd₇Hg₈₈Ar₉₀As₂₅Sb₁₀U₉₉At₉₁Th₉₁Tm₁₀₀Xe₉₉

Elemental composition of C₇₂H₂₁₅O₉Cd₇Hg₈₈Ar₉₀As₂₅Sb₁₀U₉₉At₉₁Th₉₁Tm₁₀₀Xe₉₉

Element	Symbol	Atomic weight	Atoms	Mass percent
Carbon	C	12.0107	72	0.7205
Hydrogen	H	1.00794	215	0.1805
Oxygen	O	15.9994	9	0.1200
Cadmium	Cd	112.411	7	0.6556
Mercury	Hg	200.59	88	14.7062
Argon	Ar	39.948	90	2.9953
Arsenic	As	74.92160	25	1.5605
Antimony	Sb	121.760	10	1.0144
Uranium	U	238.02891	99	19.6323
Astatine	At	209.987148	91	15.9199
Thorium	Th	232.03806	91	17.5917
Thulium	Tm	168.93421	100	14.0742
Xenon	Xe	131.293	99	10.8289

Computing molar mass step by step
First, compute the number of each atom in C₇₂H₂₁₅O₉Cd₇Hg₈₈Ar₉₀As₂₅Sb₁₀U₉₉At₉₁Th₉₁Tm₁₀₀Xe₉₉: C: 72, H: 215, O: 9, Cd: 7, Hg: 88, Ar: 90, As: 25, Sb: 10, U: 99, At: 91, Th: 91, Tm: 100, Xe: 99 Then, lookup atomic weights for each element in periodic table: C: 12.0107, H: 1.00794, O: 15.9994, Cd: 112.411, Hg: 200.59, Ar: 39.948, As: 74.9216, Sb: 121.76, U: 238.02891, At: 209.987148, Th: 232.03806, Tm: 168.93421, Xe: 131.293 Now, compute the sum of products of number of atoms to the atomic weight: Molar mass (C₇₂H₂₁₅O₉Cd₇Hg₈₈Ar₉₀As₂₅Sb₁₀U₉₉At₉₁Th₉₁Tm₁₀₀Xe₉₉) = ∑ Count_i * Weight_i = Count(C) * Weight(C) + Count(H) * Weight(H) + Count(O) * Weight(O) + Count(Cd) * Weight(Cd) + Count(Hg) * Weight(Hg) + Count(Ar) * Weight(Ar) + Count(As) * Weight(As) + Count(Sb) * Weight(Sb) + Count(U) * Weight(U) + Count(At) * Weight(At) + Count(Th) * Weight(Th) + Count(Tm) * Weight(Tm) + Count(Xe) * Weight(Xe) = 72 * 12.0107 + 215 * 1.00794 + 9 * 15.9994 + 7 * 112.411 + 88 * 200.59 + 90 * 39.948 + 25 * 74.9216 + 10 * 121.76 + 99 * 238.02891 + 91 * 209.987148 + 91 * 232.03806 + 100 * 168.93421 + 99 * 131.293 = 120030.8131 g/mol

Mass percent composition	Atomic percent composition

Formula in Hill system is C₇₂H₂₁₅Ar₉₀As₂₅At₉₁Cd₇Hg₈₈O₉Sb₁₀Th₉₁Tm₁₀₀U₉₉Xe₉₉

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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