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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of C3Ca5H16Be2K8I3Pt2Rb2Na5CdSO4CaOAl2FeO3Li3Es2RfAcW4Bh2U3Cf2 is 5571.4889 g/mol

Convert between C3Ca5H16Be2K8I3Pt2Rb2Na5CdSO4CaOAl2FeO3Li3Es2RfAcW4Bh2U3Cf2 weight and moles
CompoundMolesWeight, g
C3Ca5H16Be2K8I3Pt2Rb2Na5CdSO4CaOAl2FeO3Li3Es2RfAcW4Bh2U3Cf2

Elemental composition of C3Ca5H16Be2K8I3Pt2Rb2Na5CdSO4CaOAl2FeO3Li3Es2RfAcW4Bh2U3Cf2
ElementSymbolAtomic weightAtomsMass percent
CarbonC12.010730.6467
CalciumCa40.07864.3160
HydrogenH1.00794160.2895
BerylliumBe9.01218220.3235
PotassiumK39.098385.6141
IodineI126.9044736.8332
PlatinumPt195.08427.0029
RubidiumRb85.467823.0680
SodiumNa22.9897692852.0632
CadmiumCd112.41112.0176
SulfurS32.06510.5755
OxygenO15.999482.2973
AluminumAl26.981538620.9686
IronFe55.84511.0023
LithiumLi6.94130.3737
EinsteiniumEs252.0829829.0490
RutherfordiumRf265.116714.7585
ActiniumAc227.02775214.0748
TungstenW183.84413.1986
BohriumBh272.138029.7690
UraniumU238.02891312.8168
CaliforniumCf249.07485328.9411

Computing molar mass step by step

First, compute the number of each atom in C3Ca5H16Be2K8I3Pt2Rb2Na5CdSO4CaOAl2FeO3Li3Es2RfAcW4Bh2U3Cf2:
C: 3, Ca: 6, H: 16, Be: 2, K: 8, I: 3, Pt: 2, Rb: 2, Na: 5, Cd: 1, S: 1, O: 8, Al: 2, Fe: 1, Li: 3, Es: 2, Rf: 1, Ac: 1, W: 4, Bh: 2, U: 3, Cf: 2

Then, lookup atomic weights for each element in periodic table:
C: 12.0107, Ca: 40.078, H: 1.00794, Be: 9.012182, K: 39.0983, I: 126.90447, Pt: 195.084, Rb: 85.4678, Na: 22.98976928, Cd: 112.411, S: 32.065, O: 15.9994, Al: 26.9815386, Fe: 55.845, Li: 6.941, Es: 252.08298, Rf: 265.1167, Ac: 227.0277521, W: 183.84, Bh: 272.13803, U: 238.02891, Cf: 249.0748535

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (C3Ca5H16Be2K8I3Pt2Rb2Na5CdSO4CaOAl2FeO3Li3Es2RfAcW4Bh2U3Cf2) = ∑ Counti * Weighti =
Count(C) * Weight(C) + Count(Ca) * Weight(Ca) + Count(H) * Weight(H) + Count(Be) * Weight(Be) + Count(K) * Weight(K) + Count(I) * Weight(I) + Count(Pt) * Weight(Pt) + Count(Rb) * Weight(Rb) + Count(Na) * Weight(Na) + Count(Cd) * Weight(Cd) + Count(S) * Weight(S) + Count(O) * Weight(O) + Count(Al) * Weight(Al) + Count(Fe) * Weight(Fe) + Count(Li) * Weight(Li) + Count(Es) * Weight(Es) + Count(Rf) * Weight(Rf) + Count(Ac) * Weight(Ac) + Count(W) * Weight(W) + Count(Bh) * Weight(Bh) + Count(U) * Weight(U) + Count(Cf) * Weight(Cf) =
3 * 12.0107 + 6 * 40.078 + 16 * 1.00794 + 2 * 9.012182 + 8 * 39.0983 + 3 * 126.90447 + 2 * 195.084 + 2 * 85.4678 + 5 * 22.98976928 + 1 * 112.411 + 1 * 32.065 + 8 * 15.9994 + 2 * 26.9815386 + 1 * 55.845 + 3 * 6.941 + 2 * 252.08298 + 1 * 265.1167 + 1 * 227.0277521 + 4 * 183.84 + 2 * 272.13803 + 3 * 238.02891 + 2 * 249.0748535 =
5571.4889 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is C3H16AcAl2Be2Bh2Ca6CdCf2Es2FeI3K8Li3Na5O8Pt2Rb2RfSU3W4

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, 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

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