Molar Mass of C4H8 (Isobutylene)

Molar Mass Calculator

What is the molar mass of C₄H₈?

Answer

M(C₄H₈) =

56.108 g/mol

Atomic weights: IUPAC standard values (CIAAW, 2024).

Contribution of each element
Element	Atoms, n	Atomic weight, A	n × A, g/mol Mass fraction, w	Mass fraction, w
Ccarbon	4	12.011	48.044 w ≈ 85.63%	≈ 85.63%
Hhydrogen	8	1.0080	8.0640 w ≈ 14.37%	≈ 14.37%
Σ = 56.108 g/mol w = 100%				100%

Atomic weights: CIAAW, Abridged Standard Atomic Weights (2024)

Mass fractions of the elements

C 85.63%

H 14.37%

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Molar masses of substances nearby

Formula	M, g/mol
Fe (iron)	55.845
CaO (calcium oxide)	56.077
KOH (potassium hydroxide)	56.105
C₄H₈ (isobutylene)	56.108
MgS (magnesium sulfide)	56.37
C₃H₆O (acetone)	58.080
KF (potassium fluoride)	58.096

FAQ

What is the molar mass of C4H8?

M(C₄H₈) = 56.108 g/mol

How to calculate the molar mass of C₄H₈?

Add up the atomic weights of all the atoms in the formula: 4 × 12.011 + 8 × 1.0080 = 56.108 g/mol.

How many grams are in 2 moles of C₄H₈?

m = n × M = 2 mol × 56.108 g/mol = 112.216 g.

See Also