H1He2Li4Ca3C9Ac5Rn8Th5Sr3Dy9Rb6Cm12K8Si4 molar mass

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of H₁He₂Li₄Ca₃C₉Ac₅Rn₈Th₅Sr₃Dy₉Rb₆Cm₁₂K₈Si₄ is 9828.3932 g/mol

Convert between H₁He₂Li₄Ca₃C₉Ac₅Rn₈Th₅Sr₃Dy₉Rb₆Cm₁₂K₈Si₄ weight and moles

Compound	Moles		Weight, g
H₁He₂Li₄Ca₃C₉Ac₅Rn₈Th₅Sr₃Dy₉Rb₆Cm₁₂K₈Si₄

Elemental composition of H₁He₂Li₄Ca₃C₉Ac₅Rn₈Th₅Sr₃Dy₉Rb₆Cm₁₂K₈Si₄

Element	Symbol	Atomic weight	Atoms	Mass percent
Hydrogen	H	1.00794	1	0.0103
Helium	He	4.002602	2	0.0814
Lithium	Li	6.941	4	0.2825
Calcium	Ca	40.078	3	1.2233
Carbon	C	12.0107	9	1.0998
Actinium	Ac	227.027752	5	11.5496
Radon	Rn	210.990601	8	17.1740
Thorium	Th	232.03806	5	11.8045
Strontium	Sr	87.62	3	2.6745
Dysprosium	Dy	162.500	9	14.8804
Rubidium	Rb	85.4678	6	5.2176
Curium	Cm	243.061389	12	29.6766
Potassium	K	39.0983	8	3.1825
Silicon	Si	28.0855	4	1.1430

Computing molar mass step by step
First, compute the number of each atom in H₁He₂Li₄Ca₃C₉Ac₅Rn₈Th₅Sr₃Dy₉Rb₆Cm₁₂K₈Si₄: H: 1, He: 2, Li: 4, Ca: 3, C: 9, Ac: 5, Rn: 8, Th: 5, Sr: 3, Dy: 9, Rb: 6, Cm: 12, K: 8, Si: 4 Then, lookup atomic weights for each element in periodic table: H: 1.00794, He: 4.002602, Li: 6.941, Ca: 40.078, C: 12.0107, Ac: 227.0277521, Rn: 210.990601, Th: 232.03806, Sr: 87.62, Dy: 162.5, Rb: 85.4678, Cm: 243.0613891, K: 39.0983, Si: 28.0855 Now, compute the sum of products of number of atoms to the atomic weight: Molar mass (H₁He₂Li₄Ca₃C₉Ac₅Rn₈Th₅Sr₃Dy₉Rb₆Cm₁₂K₈Si₄) = ∑ Count_i * Weight_i = Count(H) * Weight(H) + Count(He) * Weight(He) + Count(Li) * Weight(Li) + Count(Ca) * Weight(Ca) + Count(C) * Weight(C) + Count(Ac) * Weight(Ac) + Count(Rn) * Weight(Rn) + Count(Th) * Weight(Th) + Count(Sr) * Weight(Sr) + Count(Dy) * Weight(Dy) + Count(Rb) * Weight(Rb) + Count(Cm) * Weight(Cm) + Count(K) * Weight(K) + Count(Si) * Weight(Si) = 1 * 1.00794 + 2 * 4.002602 + 4 * 6.941 + 3 * 40.078 + 9 * 12.0107 + 5 * 227.0277521 + 8 * 210.990601 + 5 * 232.03806 + 3 * 87.62 + 9 * 162.5 + 6 * 85.4678 + 12 * 243.0613891 + 8 * 39.0983 + 4 * 28.0855 = 9828.3932 g/mol

Mass percent composition	Atomic percent composition

Formula in Hill system is C₉HAc₅Ca₃Cm₁₂Dy₉He₂K₈Li₄Rb₆Rn₈Si₄Sr₃Th₅

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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