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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HHeLiBBeOPZnUClBrIAsFKWThYGe is 1334.8605 g/mol

Convert between HHeLiBBeOPZnUClBrIAsFKWThYGe weight and moles
CompoundMolesWeight, g
HHeLiBBeOPZnUClBrIAsFKWThYGe

Elemental composition of HHeLiBBeOPZnUClBrIAsFKWThYGe
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0755
HeliumHe4.00260210.2999
LithiumLi6.94110.5200
BoronB10.81110.8099
BerylliumBe9.01218210.6751
OxygenO15.999411.1986
PhosphorusP30.97376212.3204
ZincZn65.3814.8979
UraniumU238.02891117.8317
ChlorineCl35.45312.6559
BromineBr79.90415.9859
IodineI126.9044719.5069
ArsenicAs74.9216015.6127
FluorineF18.998403211.4233
PotassiumK39.098312.9290
TungstenW183.84113.7722
ThoriumTh232.03806117.3829
YttriumY88.9058516.6603
GermaniumGe72.6415.4418

Computing molar mass step by step

First, compute the number of each atom in HHeLiBBeOPZnUClBrIAsFKWThYGe:
H: 1, He: 1, Li: 1, B: 1, Be: 1, O: 1, P: 1, Zn: 1, U: 1, Cl: 1, Br: 1, I: 1, As: 1, F: 1, K: 1, W: 1, Th: 1, Y: 1, Ge: 1

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, He: 4.002602, Li: 6.941, B: 10.811, Be: 9.012182, O: 15.9994, P: 30.973762, Zn: 65.38, U: 238.02891, Cl: 35.453, Br: 79.904, I: 126.90447, As: 74.9216, F: 18.9984032, K: 39.0983, W: 183.84, Th: 232.03806, Y: 88.90585, Ge: 72.64

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HHeLiBBeOPZnUClBrIAsFKWThYGe) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(He) * Weight(He) + Count(Li) * Weight(Li) + Count(B) * Weight(B) + Count(Be) * Weight(Be) + Count(O) * Weight(O) + Count(P) * Weight(P) + Count(Zn) * Weight(Zn) + Count(U) * Weight(U) + Count(Cl) * Weight(Cl) + Count(Br) * Weight(Br) + Count(I) * Weight(I) + Count(As) * Weight(As) + Count(F) * Weight(F) + Count(K) * Weight(K) + Count(W) * Weight(W) + Count(Th) * Weight(Th) + Count(Y) * Weight(Y) + Count(Ge) * Weight(Ge) =
1 * 1.00794 + 1 * 4.002602 + 1 * 6.941 + 1 * 10.811 + 1 * 9.012182 + 1 * 15.9994 + 1 * 30.973762 + 1 * 65.38 + 1 * 238.02891 + 1 * 35.453 + 1 * 79.904 + 1 * 126.90447 + 1 * 74.9216 + 1 * 18.9984032 + 1 * 39.0983 + 1 * 183.84 + 1 * 232.03806 + 1 * 88.90585 + 1 * 72.64 =
1334.8605 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AsBBeBrClFGeHHeIKLiOPThUWYZn

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

  1. 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.
  2. 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).
  3. Calculate molar mass of each element: multiply the atomic mass of each element by the number of atoms of that element in the compound.
  4. 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.

Related: Molecular weights of amino acids

molecular weights calculated today
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