At18Nh3Ra9HoOBeCsRb22Ne37Na38SOH4Pm42Nd43Pr43Tc99 molar mass

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of At₁₈Nh₃Ra₉HoOBeCsRb₂₂Ne₃₇Na₃₈SOH₄Pm₄₂Nd₄₃Pr₄₃Tc₉₉ is 38483.5274 g/mol

Convert between At₁₈Nh₃Ra₉HoOBeCsRb₂₂Ne₃₇Na₃₈SOH₄Pm₄₂Nd₄₃Pr₄₃Tc₉₉ weight and moles

Compound	Moles		Weight, g
At₁₈Nh₃Ra₉HoOBeCsRb₂₂Ne₃₇Na₃₈SOH₄Pm₄₂Nd₄₃Pr₄₃Tc₉₉

Elemental composition of At₁₈Nh₃Ra₉HoOBeCsRb₂₂Ne₃₇Na₃₈SOH₄Pm₄₂Nd₄₃Pr₄₃Tc₉₉

Element	Symbol	Atomic weight	Atoms	Mass percent
Astatine	At	209.987148	18	9.8218
Nihonium	Nh	284.1781	3	2.2153
Radium	Ra	226.025410	9	5.2860
Holmium	Ho	164.93032	1	0.4286
Oxygen	O	15.9994	2	0.0831
Beryllium	Be	9.012182	1	0.0234
Cesium	Cs	132.9054519	1	0.3454
Rubidium	Rb	85.4678	22	4.8860
Neon	Ne	20.1797	37	1.9402
Sodium	Na	22.98976928	38	2.2701
Sulfur	S	32.065	1	0.0833
Hydrogen	H	1.00794	4	0.0105
Promethium	Pm	144.912749	42	15.8154
Neodymium	Nd	144.242	43	16.1170
Praseodymium	Pr	140.90765	43	15.7445
Technetium	Tc	96.906365	99	24.9294

Computing molar mass step by step
First, compute the number of each atom in At₁₈Nh₃Ra₉HoOBeCsRb₂₂Ne₃₇Na₃₈SOH₄Pm₄₂Nd₄₃Pr₄₃Tc₉₉: At: 18, Nh: 3, Ra: 9, Ho: 1, O: 2, Be: 1, Cs: 1, Rb: 22, Ne: 37, Na: 38, S: 1, H: 4, Pm: 42, Nd: 43, Pr: 43, Tc: 99 Then, lookup atomic weights for each element in periodic table: At: 209.987148, Nh: 284.17808, Ra: 226.0254098, Ho: 164.93032, O: 15.9994, Be: 9.012182, Cs: 132.9054519, Rb: 85.4678, Ne: 20.1797, Na: 22.98976928, S: 32.065, H: 1.00794, Pm: 144.912749, Nd: 144.242, Pr: 140.90765, Tc: 96.906365 Now, compute the sum of products of number of atoms to the atomic weight: Molar mass (At₁₈Nh₃Ra₉HoOBeCsRb₂₂Ne₃₇Na₃₈SOH₄Pm₄₂Nd₄₃Pr₄₃Tc₉₉) = ∑ Count_i * Weight_i = Count(At) * Weight(At) + Count(Nh) * Weight(Nh) + Count(Ra) * Weight(Ra) + Count(Ho) * Weight(Ho) + Count(O) * Weight(O) + Count(Be) * Weight(Be) + Count(Cs) * Weight(Cs) + Count(Rb) * Weight(Rb) + Count(Ne) * Weight(Ne) + Count(Na) * Weight(Na) + Count(S) * Weight(S) + Count(H) * Weight(H) + Count(Pm) * Weight(Pm) + Count(Nd) * Weight(Nd) + Count(Pr) * Weight(Pr) + Count(Tc) * Weight(Tc) = 18 * 209.987148 + 3 * 284.17808 + 9 * 226.0254098 + 1 * 164.93032 + 2 * 15.9994 + 1 * 9.012182 + 1 * 132.9054519 + 22 * 85.4678 + 37 * 20.1797 + 38 * 22.98976928 + 1 * 32.065 + 4 * 1.00794 + 42 * 144.912749 + 43 * 144.242 + 43 * 140.90765 + 99 * 96.906365 = 38483.5274 g/mol

Mass percent composition	Atomic percent composition

Formula in Hill system is At₁₈BeCsH₄HoNa₃₈Nd₄₃Ne₃₇Nh₃O₂Pm₄₂Pr₄₃Ra₉Rb₂₂STc₉₉

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

Please let us know how we can improve this web app.

How to cite?

Choose languageDeutschEnglishEspañol Français Italiano Nederlands Polski Português Русский 中文日本語 한국어