U904C875S4H10Rb20I165He20Hg355Au263K845Be224Li744Fe84N32Pb36 molar mass

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of U₉₀₄C₈₇₅S₄H₁₀Rb₂₀I₁₆₅He₂₀Hg₃₅₅Au₂₆₃K₈₄₅Be₂₂₄Li₇₄₄Fe₈₄N₃₂Pb₃₆ is 424385.4304 g/mol

Convert between U₉₀₄C₈₇₅S₄H₁₀Rb₂₀I₁₆₅He₂₀Hg₃₅₅Au₂₆₃K₈₄₅Be₂₂₄Li₇₄₄Fe₈₄N₃₂Pb₃₆ weight and moles

Compound	Moles		Weight, g
U₉₀₄C₈₇₅S₄H₁₀Rb₂₀I₁₆₅He₂₀Hg₃₅₅Au₂₆₃K₈₄₅Be₂₂₄Li₇₄₄Fe₈₄N₃₂Pb₃₆

Elemental composition of U₉₀₄C₈₇₅S₄H₁₀Rb₂₀I₁₆₅He₂₀Hg₃₅₅Au₂₆₃K₈₄₅Be₂₂₄Li₇₄₄Fe₈₄N₃₂Pb₃₆

Element	Symbol	Atomic weight	Atoms	Mass percent
Uranium	U	238.02891	904	50.7035
Carbon	C	12.0107	875	2.4764
Sulfur	S	32.065	4	0.0302
Hydrogen	H	1.00794	10	0.0024
Rubidium	Rb	85.4678	20	0.4028
Iodine	I	126.90447	165	4.9340
Helium	He	4.002602	20	0.0189
Mercury	Hg	200.59	355	16.7794
Gold	Au	196.966569	263	12.2064
Potassium	K	39.0983	845	7.7849
Beryllium	Be	9.012182	224	0.4757
Lithium	Li	6.941	744	1.2168
Iron	Fe	55.845	84	1.1054
Nitrogen	N	14.0067	32	0.1056
Lead	Pb	207.2	36	1.7576

Computing molar mass step by step
First, compute the number of each atom in U₉₀₄C₈₇₅S₄H₁₀Rb₂₀I₁₆₅He₂₀Hg₃₅₅Au₂₆₃K₈₄₅Be₂₂₄Li₇₄₄Fe₈₄N₃₂Pb₃₆: U: 904, C: 875, S: 4, H: 10, Rb: 20, I: 165, He: 20, Hg: 355, Au: 263, K: 845, Be: 224, Li: 744, Fe: 84, N: 32, Pb: 36 Then, lookup atomic weights for each element in periodic table: U: 238.02891, C: 12.0107, S: 32.065, H: 1.00794, Rb: 85.4678, I: 126.90447, He: 4.002602, Hg: 200.59, Au: 196.966569, K: 39.0983, Be: 9.012182, Li: 6.941, Fe: 55.845, N: 14.0067, Pb: 207.2 Now, compute the sum of products of number of atoms to the atomic weight: Molar mass (U₉₀₄C₈₇₅S₄H₁₀Rb₂₀I₁₆₅He₂₀Hg₃₅₅Au₂₆₃K₈₄₅Be₂₂₄Li₇₄₄Fe₈₄N₃₂Pb₃₆) = ∑ Count_i * Weight_i = Count(U) * Weight(U) + Count(C) * Weight(C) + Count(S) * Weight(S) + Count(H) * Weight(H) + Count(Rb) * Weight(Rb) + Count(I) * Weight(I) + Count(He) * Weight(He) + Count(Hg) * Weight(Hg) + Count(Au) * Weight(Au) + Count(K) * Weight(K) + Count(Be) * Weight(Be) + Count(Li) * Weight(Li) + Count(Fe) * Weight(Fe) + Count(N) * Weight(N) + Count(Pb) * Weight(Pb) = 904 * 238.02891 + 875 * 12.0107 + 4 * 32.065 + 10 * 1.00794 + 20 * 85.4678 + 165 * 126.90447 + 20 * 4.002602 + 355 * 200.59 + 263 * 196.966569 + 845 * 39.0983 + 224 * 9.012182 + 744 * 6.941 + 84 * 55.845 + 32 * 14.0067 + 36 * 207.2 = 424385.4304 g/mol

Mass percent composition	Atomic percent composition

Formula in Hill system is C₈₇₅H₁₀Au₂₆₃Be₂₂₄Fe₈₄He₂₀Hg₃₅₅I₁₆₅K₈₄₅Li₇₄₄N₃₂Pb₃₆Rb₂₀S₄U₉₀₄

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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