La2Ce3Pr4Nd3Pm5Sm7Eu4Gd4Tb9Dy4HO9Er4Tm9YB3Lu7Ac3Th4U4NP5 molar mass

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of La₂Ce₃Pr₄Nd₃Pm₅Sm₇Eu₄Gd₄Tb₉Dy₄HO₉Er₄Tm₉YB₃Lu₇Ac₃Th₄U₄NP₅ is 13199.5630 g/mol

Convert between La₂Ce₃Pr₄Nd₃Pm₅Sm₇Eu₄Gd₄Tb₉Dy₄HO₉Er₄Tm₉YB₃Lu₇Ac₃Th₄U₄NP₅ weight and moles

Compound	Moles		Weight, g
La₂Ce₃Pr₄Nd₃Pm₅Sm₇Eu₄Gd₄Tb₉Dy₄HO₉Er₄Tm₉YB₃Lu₇Ac₃Th₄U₄NP₅

Elemental composition of La₂Ce₃Pr₄Nd₃Pm₅Sm₇Eu₄Gd₄Tb₉Dy₄HO₉Er₄Tm₉YB₃Lu₇Ac₃Th₄U₄NP₅

Element	Symbol	Atomic weight	Atoms	Mass percent
Lanthanum	La	138.90547	2	2.1047
Cerium	Ce	140.116	3	3.1846
Praseodymium	Pr	140.90765	4	4.2701
Neodymium	Nd	144.242	3	3.2783
Promethium	Pm	144.912749	5	5.4893
Samarium	Sm	150.36	7	7.9739
Europium	Eu	151.964	4	4.6051
Gadolinium	Gd	157.25	4	4.7653
Terbium	Tb	158.92535	9	10.8362
Dysprosium	Dy	162.500	4	4.9244
Hydrogen	H	1.00794	1	0.0076
Oxygen	O	15.9994	9	1.0909
Erbium	Er	167.259	4	5.0686
Thulium	Tm	168.93421	9	11.5186
Yttrium	Y	88.90585	1	0.6736
Boron	B	10.811	3	0.2457
Lutetium	Lu	174.9668	7	9.2788
Actinium	Ac	227.027752	3	5.1599
Thorium	Th	232.03806	4	7.0317
Uranium	U	238.02891	4	7.2132
Nitrogen	N	14.0067	1	0.1061
Phosphorus	P	30.973762	5	1.1733

Computing molar mass step by step
First, compute the number of each atom in La₂Ce₃Pr₄Nd₃Pm₅Sm₇Eu₄Gd₄Tb₉Dy₄HO₉Er₄Tm₉YB₃Lu₇Ac₃Th₄U₄NP₅: La: 2, Ce: 3, Pr: 4, Nd: 3, Pm: 5, Sm: 7, Eu: 4, Gd: 4, Tb: 9, Dy: 4, H: 1, O: 9, Er: 4, Tm: 9, Y: 1, B: 3, Lu: 7, Ac: 3, Th: 4, U: 4, N: 1, P: 5 Then, lookup atomic weights for each element in periodic table: La: 138.90547, Ce: 140.116, Pr: 140.90765, Nd: 144.242, Pm: 144.912749, Sm: 150.36, Eu: 151.964, Gd: 157.25, Tb: 158.92535, Dy: 162.5, H: 1.00794, O: 15.9994, Er: 167.259, Tm: 168.93421, Y: 88.90585, B: 10.811, Lu: 174.9668, Ac: 227.0277521, Th: 232.03806, U: 238.02891, N: 14.0067, P: 30.973762 Now, compute the sum of products of number of atoms to the atomic weight: Molar mass (La₂Ce₃Pr₄Nd₃Pm₅Sm₇Eu₄Gd₄Tb₉Dy₄HO₉Er₄Tm₉YB₃Lu₇Ac₃Th₄U₄NP₅) = ∑ Count_i * Weight_i = Count(La) * Weight(La) + Count(Ce) * Weight(Ce) + Count(Pr) * Weight(Pr) + Count(Nd) * Weight(Nd) + Count(Pm) * Weight(Pm) + Count(Sm) * Weight(Sm) + Count(Eu) * Weight(Eu) + Count(Gd) * Weight(Gd) + Count(Tb) * Weight(Tb) + Count(Dy) * Weight(Dy) + Count(H) * Weight(H) + Count(O) * Weight(O) + Count(Er) * Weight(Er) + Count(Tm) * Weight(Tm) + Count(Y) * Weight(Y) + Count(B) * Weight(B) + Count(Lu) * Weight(Lu) + Count(Ac) * Weight(Ac) + Count(Th) * Weight(Th) + Count(U) * Weight(U) + Count(N) * Weight(N) + Count(P) * Weight(P) = 2 * 138.90547 + 3 * 140.116 + 4 * 140.90765 + 3 * 144.242 + 5 * 144.912749 + 7 * 150.36 + 4 * 151.964 + 4 * 157.25 + 9 * 158.92535 + 4 * 162.5 + 1 * 1.00794 + 9 * 15.9994 + 4 * 167.259 + 9 * 168.93421 + 1 * 88.90585 + 3 * 10.811 + 7 * 174.9668 + 3 * 227.0277521 + 4 * 232.03806 + 4 * 238.02891 + 1 * 14.0067 + 5 * 30.973762 = 13199.5630 g/mol

Mass percent composition	Atomic percent composition

Formula in Hill system is Ac₃B₃Ce₃Dy₄Er₄Eu₄Gd₄HLa₂Lu₇NNd₃O₉P₅Pm₅Pr₄Sm₇Tb₉Th₄Tm₉U₄Y

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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