#### Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of C4H8O2 is 88.1051 g/mol
Convert between C4H8O2 weight and moles
 Compound Moles Weight, g C4H8O2

Elemental composition of C4H8O2
ElementSymbolAtomic weightAtomsMass percent
CarbonC12.0107454.5290
HydrogenH1.0079489.1522
OxygenO15.9994236.3189

 Mass percent composition Atomic percent composition

Sample reactions for C4H8O2
 Equation Reaction type C4H8O2 + O2 = CO2 + H2O combustion C4H8O2 + H2 = C2H6O synthesis

Formula in Hill system is C4H8O2

### 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, Ts, Tos, Bz, TMS, tBu, Bzl, Bn, Dmg
• parantesis () or brackets [].
• Common compound names.
Examples of molar mass computations: NaCl, Ca(OH)2, K4[Fe(CN)6], CuSO4*5H2O, water, nitric acid, potassium permanganate, ethanol, fructose.

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 of molecular mass, molecular weight, molar mass and molar weight

• 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.
Weights of atoms and isotopes are from NIST article.