A substance has an empirical formula of ch2 and a molar mass of 56 grams per mole. The molecular formula for this compound is

The molecular formula for the compound is C4H8.

Explanation:

Emperical formula is CH2

Molar mass = 56 g/mol

Molar mass = (CH2)n

56 = (12 + 1×2)n

56 = (12 + 2)n

14n = 56

n = 56/14 = 4

Molecular formula = (CH2)n = (CH2)4 = C4H8

C₄H₈

Explanation:

Molecular Formula: The molecular formula of a compound gives the exact number of moles of atom of the component elements in one mole of the compound.

From the question,

Molecular formula = (CH₂)ₙ

(CH₂)ₙ = 56 Equation 1

Where the molar mass of C = 12 g/mole, H = 1 g/mole.

Substitute into equation 1

[12+(1×2)]ₙ = 56

(12+2)ₙ = 56

14n = 56

n = 56/14

n = 4

Molecular formula = (CH₂)₄

molecular formula = C₄H₈

Hence the molecular formula of the compound is C₄H₈

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