Gd40Tb41Ho42Er43Tm44Yb45Lu46Th47Pa48U49Np50Pu51Am52Cm53Bk540 molar mass

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of Gd₄₀Tb₄₁Ho₄₂Er₄₃Tm₄₄Yb₄₅Lu₄₆Th₄₇Pa₄₈U₄₉Np₅₀Pu₅₁Am₅₂Cm₅₃Bk₅₄₀ is 266631.1161 g/mol

Convert between Gd₄₀Tb₄₁Ho₄₂Er₄₃Tm₄₄Yb₄₅Lu₄₆Th₄₇Pa₄₈U₄₉Np₅₀Pu₅₁Am₅₂Cm₅₃Bk₅₄₀ weight and moles

Compound	Moles		Weight, g
Gd₄₀Tb₄₁Ho₄₂Er₄₃Tm₄₄Yb₄₅Lu₄₆Th₄₇Pa₄₈U₄₉Np₅₀Pu₅₁Am₅₂Cm₅₃Bk₅₄₀

Elemental composition of Gd₄₀Tb₄₁Ho₄₂Er₄₃Tm₄₄Yb₄₅Lu₄₆Th₄₇Pa₄₈U₄₉Np₅₀Pu₅₁Am₅₂Cm₅₃Bk₅₄₀

Element	Symbol	Atomic weight	Atoms	Mass percent
Gadolinium	Gd	157.25	40	2.3591
Terbium	Tb	158.92535	41	2.4438
Holmium	Ho	164.93032	42	2.5980
Erbium	Er	167.259	43	2.6974
Thulium	Tm	168.93421	44	2.7878
Ytterbium	Yb	173.054	45	2.9207
Lutetium	Lu	174.9668	46	3.0186
Thorium	Th	232.03806	47	4.0902
Protactinium	Pa	231.03588	48	4.1592
Uranium	U	238.02891	49	4.3744
Neptunium	Np	236.04657	50	4.4265
Plutonium	Pu	238.049560	51	4.5533
Americium	Am	241.056829	52	4.7012
Curium	Cm	243.061389	53	4.8315
Berkelium	Bk	247.070307	540	50.0384

Computing molar mass step by step
First, compute the number of each atom in Gd₄₀Tb₄₁Ho₄₂Er₄₃Tm₄₄Yb₄₅Lu₄₆Th₄₇Pa₄₈U₄₉Np₅₀Pu₅₁Am₅₂Cm₅₃Bk₅₄₀: Gd: 40, Tb: 41, Ho: 42, Er: 43, Tm: 44, Yb: 45, Lu: 46, Th: 47, Pa: 48, U: 49, Np: 50, Pu: 51, Am: 52, Cm: 53, Bk: 540 Then, lookup atomic weights for each element in periodic table: Gd: 157.25, Tb: 158.92535, Ho: 164.93032, Er: 167.259, Tm: 168.93421, Yb: 173.054, Lu: 174.9668, Th: 232.03806, Pa: 231.03588, U: 238.02891, Np: 236.04657, Pu: 238.0495599, Am: 241.0568291, Cm: 243.0613891, Bk: 247.070307 Now, compute the sum of products of number of atoms to the atomic weight: Molar mass (Gd₄₀Tb₄₁Ho₄₂Er₄₃Tm₄₄Yb₄₅Lu₄₆Th₄₇Pa₄₈U₄₉Np₅₀Pu₅₁Am₅₂Cm₅₃Bk₅₄₀) = ∑ Count_i * Weight_i = Count(Gd) * Weight(Gd) + Count(Tb) * Weight(Tb) + Count(Ho) * Weight(Ho) + Count(Er) * Weight(Er) + Count(Tm) * Weight(Tm) + Count(Yb) * Weight(Yb) + Count(Lu) * Weight(Lu) + Count(Th) * Weight(Th) + Count(Pa) * Weight(Pa) + Count(U) * Weight(U) + Count(Np) * Weight(Np) + Count(Pu) * Weight(Pu) + Count(Am) * Weight(Am) + Count(Cm) * Weight(Cm) + Count(Bk) * Weight(Bk) = 40 * 157.25 + 41 * 158.92535 + 42 * 164.93032 + 43 * 167.259 + 44 * 168.93421 + 45 * 173.054 + 46 * 174.9668 + 47 * 232.03806 + 48 * 231.03588 + 49 * 238.02891 + 50 * 236.04657 + 51 * 238.0495599 + 52 * 241.0568291 + 53 * 243.0613891 + 540 * 247.070307 = 266631.1161 g/mol

Mass percent composition	Atomic percent composition

Formula in Hill system is Am₅₂Bk₅₄₀Cm₅₃Er₄₃Gd₄₀Ho₄₂Lu₄₆Np₅₀Pa₄₈Pu₅₁Tb₄₁Th₄₇Tm₄₄U₄₉Yb₄₅

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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